Sunlight Matters

In this episode, our guest is Christina Friis Blach, co-founder of Lys Technologies, about how light shapes our health, performance, and daily lives.They explore how sunlight exposure and circadian rhythms influence sleep, hormones, and energy—and why modern indoor environments often disrupt this balance.Christina shares how her company is helping bridge the gap between science and real life through wearable light technology and sunlight analysis tools.☀️ About Lys TechnologiesLys Technologies develops wearable sensors that measure the light you’re actually exposed to throughout the day—close to the eye, where it matters biologically.Unlike traditional light meters used in architecture, their technology focuses on human-centric lighting, tracking how light impacts: Circadian rhythms and sleep  Hormone regulation (melatonin, cortisol)  Daily energy and performance Their tools are used globally across research, healthcare, workplace design, and even elite sports—helping drive better sunlight analysis, building design, and behavior change.☀️ Key Takeaways Light is a biological signal, not just for vision  Modern lighting can disrupt circadian rhythms  Wearable sensors enable real-world solar exposure tracking Natural light is critical in real estate and building designShadow mapping and sunlight analysis are shaping healthier spaces Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

In this thought-provoking episode, we sit down with Jonathan Jarecki, a 20-year-old pre-med student exploring the frontier of light biology, mitochondrial function, and the hidden impact of our modern indoor lifestyle.What begins as a conversation about holistic health quickly evolves into a powerful exploration of how sunlight exposure, artificial lighting, and our disconnection from nature may be influencing everything from energy levels and brain function to chronic disease and mental health.Jonathan shares his personal journey, from being raised in a household focused on lifestyle-based healing to diving into the scientific literature to understand why these approaches work. Along the way, he uncovers a missing piece in modern health conversations:👉 Light is not just important—it may be foundational.🌞 Sunlight vs Modern LivingWe live in a world where: Most of our time is spent indoors  Artificial LED lighting dominates our environment  Morning sunlight exposure is rare  Screen time is constant Yet human biology evolved under full-spectrum natural sunlight.This episode explores how that mismatch may be contributing to: Rising chronic disease  Hormonal disruption  Poor sleep and circadian misalignment ⚡ The Mitochondria Connection: Are We Light-Powered?One of the most fascinating parts of the conversation dives into the science of mitochondria—the energy engines of our cells.Jonathan breaks down complex biology into simple ideas, explaining how: Mitochondria convert food into usable energy (ATP)  Light—especially red and infrared wavelengths—interacts directly with these systems This raises a profound idea:👉 Humans may not just run on food—we may also be deeply influenced by light as an energy source.🧠 Light, Brain Function & AttentionThe conversation also explores how light shapes: Brain chemistry  Cognitive performance  Mood and perception From morning sunlight exposure to outdoor environments, we discuss how something as simple as getting outside early in the day can: Improve focus and clarity  Regulate dopamine  Reduce dependence on screens  Support long-term mental health In contrast, modern habits, like waking up and immediately scrolling, may be working against our biology.🔬 Questioning Modern Science & MedicineThis episode doesn’t just explore light—it challenges how we think about health itself.Jonathan highlights: The limitations of reductionist science The ongoing replication crisis in research The need for open-minded, systems-based thinkingRather than viewing the body as separate parts (brain, gut, heart), we explore a more integrated model:👉 The body as an interconnected energy system, influenced by light, environment, and lifestyle.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

In this special in-person episode of Sunlight Matters, recorded on a sun-drenched rooftop terrace in Alicante, Dave and Georg are joined by daylight expert Paul Rogers to explore the profound relationship between sunlight, architecture, and human wellbeing.From the emotional impact of dark living spaces to the life-changing benefits of solar exposure, the conversation blends personal stories with expert insight. The trio reflects on how sunlight shapes our mood, energy, and health—often subconsciously—and why access to natural light should be a fundamental priority in housing design.They also dive into the science and strategy behind sunlight analysis, shadow mapping, and solar exposure, highlighting how tools and awareness can transform the way we design homes, cities, and living environments. The discussion reveals a powerful truth: whether it's a terrace in Spain or a skylight at home, access to sunlight is not a luxury—it’s essential.🔑 Key Topics Covered☀️ Why humans instinctively seek sunlightFrom winter escapes to beach culture, we explore the biological and psychological drivers behind our attraction to the sun.🧠 Sunlight and mental healthPersonal stories of living in dark basements and poorly lit homes reveal the deep connection between light deprivation and well-being.🏡 The importance of daylight in architectureHow window placement, skylights, and room proportions influence mood, productivity, and comfort.🌇 Sunlight vs. shade: designing for different climatesWhy northern regions crave sunlight, while southern climates require intelligent shading strategies.🧰 Shadow mapping & sunlight analysisHow digital tools are revolutionizing real estate decisions, urban planning, and building design.🌍 Light inequality and housing challengesA discussion on access to daylight as a social issue—and why better standards are needed.🌞 The terrace effectWhy even a small outdoor space with good solar exposure can dramatically improve quality of life.💡 Key TakeawaysAccess to natural light is a core human need, not a luxury.Poor daylight design can negatively impact mental health and wellbeing.Sunlight analysis and shadow mapping are powerful tools for better homes and cities.Outdoor spaces with good solar exposure—like terraces—can transform daily life.Awareness is the first step: once people understand light, they begin to demand better environments.🎧 Closing ThoughtWe don’t just enjoy sunlight—we depend on it. And whether through thoughtful design, better tools, or simply paying attention, reconnecting with the sun may be one of the most powerful ways to improve how we live.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

From Fight Camp to Sunlight: In this episode of Sunlight Matters, guest host George Alexander speaks with professional kickboxer and osteopath Nathan, currently ranked #1 heavyweight in the UK for Muay Thai and #2 for K-1 kickboxing.Nathan shares how working with previous podcast guest, health practitioner Teresa Bug, completely reshaped his approach to performance — moving beyond traditional calories-in/calories-out fitness culture into a deeper understanding of sunlight exposure, circadian rhythms, natural nutrition, and recovery.The conversation explores how simple changes like morning sunlight exposure, red light therapy, better sleep timing, and natural food sources dramatically improved his energy, recovery, and training performance.One of the biggest shifts Nathan made was understanding the importance of sunlight exposure and circadian health.Key sunlight habits he implemented:Morning sunrise exposure whenever possibleUsing a near-infrared red light therapy panel during winterPlanning his home orientation using a shadow mapping app to ensure morning sunThis is a practical example of sunlight analysis in real life, where sunlight exposure influences decisions such as choosing a flat with a balcony facing the sunrise.Key TakeawaysSunlight exposure plays a major role in energy, sleep, and recovery.Red light therapy can help when natural sunlight isn’t available.Circadian health influences performance as much as training does.Natural food sources can replace many synthetic supplements.Small lifestyle changes can produce measurable performance improvements.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

Was the global ban on incandescent light bulbs really a climate breakthrough — or did we rush into a lighting revolution without fully understanding the biological and environmental consequences?In this episode, Dave speaks with journalist and author Anna about her book Incandescent and her unexpected journey into the politics and science of modern lighting. What began as a personal health reaction to new “energy-efficient” bulbs became a much deeper investigation into how we regulate light, how we measure it, and how profoundly it shapes human life.🌞 In This Episode:How Anna’s personal experience with CFL lighting sparked a global investigationWhy incandescent bulbs were labeled “inefficient” — and what that metric ignoredThe limits of measuring light purely in lumens per wattHow lighting regulations treated bulbs like simple appliances rather than biological influencesThe rise of LED lighting and the explosion of artificial light at nightThe impact of light on circadian rhythms, mood, immunity, and overall healthThe politics and ideology behind the global incandescent phase-outWhy light pollution is an environmental issue hiding in plain sightWhether behavior change (dimming, switching off, reducing overlighting) matters more than bulb typeThey explore how lighting policy focused almost entirely on efficiency while overlooking spectrum quality, flicker, environmental impact, and the complex ways light interacts with human biology.From circadian rhythms and sleep health to the loss of dark skies and its effects on wildlife, this conversation asks a bigger question:If every living system on Earth evolved under natural cycles of sunlight and darkness, what happens when we radically alter that balance?Lightspiracy isn’t about nostalgia — it’s about rethinking our relationship with light, energy, and the rhythms that shaped us ☀️📚 Further ReadingIf this episode sparked your curiosity, explore Anna Levin’s powerful books on light, darkness, and our evolving relationship with illumination:🌞 Incandescent: We Need to Talk About Light A deeply personal and investigative journey into the global phase-out of incandescent lighting — and what it means for health, environment, and policy. 👉 https://saraband.net/sb-title/incandescent/🌌 Dark Skies: A Journey into the Night An exploration of light pollution, the loss of the night sky, and why darkness is essential for both human and ecological wellbeing. 👉 https://saraband.net/sb-title/dark-skies/Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

What if the human body isn’t powered by calories alone?In this thought-provoking episode, we sit down with Austrian filmmaker P.A. Straubinger, creator of the groundbreaking documentary In the Beginning There Was Light, to explore one of the most controversial and fascinating questions in modern science:👉 What is life energy?We dive into breatharianism, fasting, biophotons, mitochondria, the fourth phase of water, and the growing tension between scientific materialism and emerging research on light and consciousness.Is the body just a biochemical machine — or is there more going on?P.A. shares insights from over 10 years of research, interviews with scientists and spiritual practitioners, and the personal experiences that shifted his worldview beyond conventional biology. We discuss:• The limits of the caloric theory of metabolism • Why up to 23% of human energy may be unexplained • Fasting, autophagy, and Nobel Prize-winning science • Light as an information carrier in food • Gerald Pollack’s research on structured water • Why questioning scientific dogma isn’t anti-science • The importance of sunlight in modern livingThis episode isn’t about proving breatharianism — it’s about opening a conversation around consciousness, light, metabolism, and our relationship to the sun.If you're interested in bioenergetics, fasting, natural light, mitochondrial health, or the future of science, this conversation will challenge your assumptions in the best possible way.🎬 Watch P.A.’s documentary: In the Beginning There Was Lighthttps://www.lightdocumentary.com/Direct links to watch the movie on demand:https://vimeo.com/ondemand/lightdocumentary (English subtitles)https://vimeo.com/ondemand/lightus (English Voice Over)And with a subscription on GAIA https://www.gaia.com/video/beginning-there-was-lightSunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

Glass, Sunlight & Human HealthIn the first episode of Series 2, we’re joined by daylighting expert and chemical engineer Joe Menchefski to explore a critical but often overlooked topic in modern building design: glass.While low-E glass and LED lighting have dramatically improved energy efficiency, emerging research suggests they may also filter out parts of the light spectrum essential for human health.Are our buildings optimized for energy — but not for biology?🌞 What We CoverWhy humans now spend 90–95% of their time indoorsHow low-E glass works — and what it blocksThe possible link between filtered light and rising childhood myopiaWhy full-spectrum sunlight matters for eye developmentThe impact of LED lighting on circadian rhythmsBlue light, red light, and mitochondrial healthThe balance between energy efficiency and human wellbeingVacuum-insulated glass (VIG) as a potential breakthroughPassive design, orientation, and smarter daylight strategiesWhy architects are beginning to rethink glass design🔬 Key ThemesFull-spectrum natural light is not just visual — it’s biologicalBuildings without proper daylight may impact sleep, metabolism, and productivityEnergy efficiency alone is not a complete design strategyHealth-optimized building design is an emerging frontier🏗 Why It MattersFrom rising myopia rates in children to circadian disruption in adults, the way we design windows, façades, and lighting systems may be shaping long-term public health outcomes.This episode kicks off Series 2 by asking an essential question:Are we designing buildings for performance metrics — or for people?Read the accompanying blog here: https://shadowmap.org/learn/are-our-windows-making-us-sickSunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

In this insightful podcast discussion, friend of the podcast, Professor Glen Jeffery, sheds light on his recent study published in Nature (https://www.nature.com/articles/s41598-026-35389-6)IntroductionIn a world dominated by LED lighting, we often overlook its potential health consequences. Professor Glen Jeffery's groundbreaking study highlights the significant effects of artificial lighting on our vision and overall metabolic health.The Research BackgroundProfessor Jeffery begins by addressing growing concerns about how artificial lighting affects our health, particularly in environments with scarce natural light. The study was conducted in a building at University College London. The hypothesis was that the lack of natural light and the prevalence of LED lighting could be detrimental to overall health, particularly in terms of colour perception and metabolic functions.The ExperimentThe unique aspect of this study was its real-world setting. Instead of a controlled laboratory, the researchers chose an office environment where participants would typically work. Participants were given old incandescent light bulbs, which emit a broader spectrum of light, including infrared, crucial for metabolic health. Surprising ResultsThe results were striking: participants showed a highly significant improvement in their vision after only a short exposure to incandescent lighting. This improvement persisted for months after the bulbs were removed, suggesting that exposure to a broader spectrum of light is vital for visual and metabolic health. Professor Jeffery emphasised that this study is a wake-up call about the damaging effects of LED lights, which may suppress our physiological functions, including colour vision.The Importance of a Balanced Light SpectrumProfessor Jeffery highlighted that while LED lighting is often considered energy-efficient, it poses risks to human health by limiting the spectrum of light we are exposed to. He discussed the need for architects and lighting engineers to rethink building design, emphasising the importance of incorporating a wider spectrum of light for optimal health. The study also raised concerns about the glass materials used in buildings, which block essential infrared light.Moving Forward: Practical SolutionsTo address these challenges, Professor Jeffery suggests we don’t need to eliminate LEDs entirely. Instead, he advocates a balanced approach to lighting by integrating incandescent bulbs into our environments. Simple measures, such as using incandescent bulbs with dimmer switches, can mitigate the negative effects of LED lighting. He also urges policymakers to rethink regulations surrounding incandescent bulbs to ensure a healthier future.Key TakeawaysLED lighting may impair our vision and metabolic health.Exposure to incandescent bulbs can significantly improve colour perception and overall well-being.A balanced approach to lighting, incorporating a variety of light sources, is essential for our health.Policymakers must prioritise health implications when designing lighting regulations.The paper is available for download here: https://www.nature.com/articles/s41598-026-35389-6Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

In this episode of Sunlight Matters, Dave sits down with the brilliant Paula Longato—architect, daylight consultant, and lighting designer—to explore why daylight access and sunlight analysis are critical yet often overlooked elements in urban design and architecture.🎙️ What You'll Learn:Why modern cities like New York and Dubai are "dark daylight cities" 🌆The role of shadow mapping and solar exposure in creating healthier urban environmentsHow real estate sun studies can shape better buildings and energy-efficient homesThe silent power of green light, and how vegetation affects our mental and physical health 🌿Why vernacular architecture holds the key to future-ready, climate-conscious citiesThe untapped potential of darkness design and the physiological dangers of over-illumination 🌒💡 Paula shares her journey from sun-soaked São Paulo to the grey skies of Germany—and how that shift sparked a lifelong passion for daylight architecture and sunlight-responsive urban planning. Together, they tackle the complexities of building orientation, facade engineering, and circadian lighting, offering a holistic view of how we can—and must—build better with the sun in mind.🌇 Whether you're an architect, city planner, homebuyer, or just someone chasing sunlight, this episode will shift the way you think about the built environment and your place within it.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

Dave sits down with Ulysse Dormoy, CEO of Atrium Ltd, to explore a subject hiding in plain sight: the light we live under every day — and how it’s quietly impacting our health, performance, and wellbeing 🌞🏙️What starts as a conversation about lighting design quickly reveals a much bigger story. From LED flicker and infrared deprivation, to the shocking parallels between ultra-processed food and ultra-processed light, Ulysse shares his journey into the world of light as a biological force.We dive into: 🔎 How modern offices and homes are robbing us of essential light 🌿 Why sunlight exposure, shadow mapping, and solar orientation matter more than ever 🧠 The science behind photobiomodulation and its rising popularity 🏢 The silent health risks baked into energy-efficient architecture 🚶‍♂️ What designers, planners, and employers can do to build truly healthy environmentsYou’ll also hear why Ulysse carries a spectrometer everywhere, what happens when beauty brands get lighting wrong, and how we might be heading towards a "lighting tobacco moment" — where health meets accountability ⚠️Whether you're an architect, designer, developer, or just spend too much time indoors, this episode will change the way you think about light, space, and health forever 🌇Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

What if everything you thought you knew about sunlight was just scratching the surface? ☀️🔬In this illuminating episode of Sunlight Matters, hosts Dave and Georg sit down with world-renowned astrophysicist Dr. Bob Fosbury — a former senior scientist with the European Space Agency, key contributor to both the Hubble and James Webb Space Telescopes 🔭, and a trailblazer at the intersection of astronomy, biology, and human health.🌌 From black holes and the Big Bang to mitochondria and macular degeneration, Bob connects the dots between cosmic light and cellular life in a way that’s as profound as it is practical. This is not just science — this is a blueprint for how to live in harmony with the energy source that powers everything on Earth: the Sun. 🎙️ Together we explore how infrared light, once overlooked, is now recognized as vital for metabolism, ageing, mitochondrial health, and even mental clarity. You’ll understand why modern architecture, LED lighting, and indoor living might be depriving us of essential solar wavelengths — and what steps we can take to reconnect with full-spectrum sunlight in our homes, cities, and everyday lives. ☀️ In This Wide-Ranging Episode, We Cover:🌌 The origins of light — and how it shaped the universe🌱 How photosynthesis and metabolism mirror the thermodynamics of stars🧬 The role of infrared light in mitochondrial function and ATP production🚨 Why white LED lights may be disrupting human biology and increasing disease risk🏢 How urban planning, window glass, and building design limit natural solar exposure🧠 How entropy, aging, and light are intimately connected🧭 Why understanding the energy flow of life can help us build healthier, more sustainable systems🌞 The future of sunlight-based health interventions, lighting design, and planetary livingWhether you're a curious mind, an architect, a real estate professional, a health practitioner, or someone exploring the science of sunlight for personal vitality, this episode offers new frameworks, ancient truths, and practical insights. You’ll never view the Sun (or your indoor lights) the same way again. Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

In this companion episode to the Roger Seheult episode, Dave is joined by three experts—Prof. Glen Jeffery, Scott Zimmerman, and Dr. Bob Fosbury—to explore how sunlight and infrared light influence human health, particularly in the darker months when Seasonal Affective Disorder (SAD) becomes more prevalent.Dave opens up about his own experience with SAD, leading to a wide-ranging discussion of how modern indoor lighting, architecture, and urban planning fail to meet the biological needs shaped by our evolution under the sun.☀️ Key Topics Covered:🌤️ 1. Sunlight, Metabolism & Infrared LightSunlight isn’t just about visible light; it’s packed with near and mid-infrared radiation that helps us metabolize food more efficiently.Buildings and LED lighting systems block this critical part of the light spectrum, leaving our bodies in a state of "metabolic darkness."Even on cloudy days and in indirect light, infrared exposure still provides meaningful benefits.🧬 2. The Mitochondrial ConnectionMitochondria, our cells' energy centers, thrive in infrared-rich environments.There’s compelling evidence suggesting that light exposure, especially infrared, directly influences aging, energy levels, and immunity.🏡 3. Indoor Light vs Outdoor LightModern architecture prioritizes energy efficiency (e.g., LED lighting and infrared-reflective glass), but at a steep cost to human health.Real estate sun studies and shadow mapping in urban design must now account for solar exposure and infrared access, especially in northern latitudes.💡 4. Incandescent vs. LED Light DebateAll three experts agree: incandescent bulbs are far superior to modern LEDs in terms of health benefits because they emit full-spectrum, thermal light—including infrared.LEDs emit light for vision, not for life. This has triggered a global metabolic health crisis, especially in developed nations.🔥 5. Practical Tips to Survive WinterUse incandescent bulbs indoors with dimmers (e.g., oven or heat lamp bulbs).Spend time outside daily, even if it's cloudy—clouds reflect valuable infrared.Install a small outdoor sun shelter or plastic greenhouse to maximize sun exposure.Use a fireplace or candles to reintroduce thermal light into the home.Saunas also provide therapeutic benefits through infrared exposure and vasodilation.Reconsider the window design, indoor layout, and lighting strategy to optimize natural light orientation.🌎 Broader Implications:The discussion highlights how our evolutionary biology is deeply tied to the solar spectrum, yet modern society is stripping us of this essential relationship. There’s a pressing need for policy changes around building codes, indoor lighting regulations, and environmental design to restore sunlight accessibility in our daily lives.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

As winter approaches in the North, the days get shorter, the skies darker, and for many of us, our energy, mood, and health start to dip. In Part 1 of a 2-part special of Sunlight Matters, Dr Roger Seheult joins Dave and Georg to share science-backed tips to help you stay healthy, energized, and resilient through the long winter nights.From understanding the hidden power of infrared light to simple daily routines that boost your immune system and mood, this episode is packed with practical advice for winter wellness—even when it’s cold, cloudy, and grey.🌟 What You’ll Learn:Why spending just 15–20 minutes outdoors (even in cloud cover) can boost your mitochondria and moodHow to make your indoor environment healthier using incandescent bulbs or even a simple fireplaceWhat types of clothing still let infrared light through—and why that matters in winterThe truth about vitamin D, UV exposure, and whether supplements or food sources are enoughCity dwellers: how to find hidden patches of winter sun between buildings and treesThe surprising benefits of saunas, cold plunges, and honoring your body’s slower winter rhythmWhy old wisdom—like afternoon walks and letting in sunlight—might be good for us☀️ This episode is all about resetting your relationship with winter—with strategies that cost little or nothing but make a big difference. Whether you're fighting the winter blues, looking to boost your energy, or just want to stay well, these are the seasonal habits your body has been craving.📲 Listen now and build your personal toolkit for surviving (and even enjoying) the darker months ahead.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

In this thought-provoking episode of Sunlight Matters, we travel across Europe to explore how daylight access, sunlight rights, and urban densification intersect—and often clash.Joining us are three brilliant minds working at the forefront of daylight analysis and sunlight legislation:🌞 Mina Gaarder – A Civil Engineer based in Norway who recently completed a master’s thesis on daylight in dense urban areas, comparing regulatory frameworks in Norway, Sweden, the UK, and the U.S. She brings a research-driven lens to how daylight affects housing quality, health, and urban form.🌞 Susanne Höglin – Stockholm-based building permit architect and former case manager at Stockholm Municipality. Now working at ACC Glas och Fasadkonsult, she investigates how urban densification affects daylight access in existing buildings and how legislation is keeping pace (or not).🌞 Eftychia Stamataki – Architect and energy-efficient buildings expert, originally from Greece and now based in Stockholm. At ACC Glas och Fasadkonsult, she leads projects on daylight and sunlight studies, as well as thermal comfort, and advocates for the better integration of sunlight in early-stage urban design.Together, we unpack:🌇 The difference between daylight and sunlight—and why it matters🏙️ How shadow mapping tools like Shadowmap empower citizens to challenge poor planning⚖️ Why laws protecting existing building light access missing or weak in many countries📐 How older urban codes used geometry to protect sunlight—and what we’ve lost in the digital age🗣️ Why public education and democratization of urban design are vital to fair developmentIf you're interested in sunlight analysis, urban planning best practices, or want to understand how sun exposure impacts health and housing quality, this episode is for you.🔦 Don’t miss this deep dive into the bright side of building cities better.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

In this episode, we are joined by David Herrera, better known online as The Solar Athlete, who brings a unique blend of engineering, biology, and real-world coaching to the conversation. From his backyard in high-altitude Wyoming, David shares the incredible journey that took him from world-class powerlifter and oilfield technician to a leading voice on circadian biology, light hygiene, and solar optimization for human performance.In this episode, we dive into:☀️ Why sunlight exposure is the most overlooked tool for boosting vitality, performance, and sleep quality 🌡️ How cold and solar exposure work together to regulate metabolism, brain function, and melanin repair 📶 What happens when you're living next to a cell tower, and why EMF awareness is critical to long-term health 🏠 The role of melanin as a biological semiconductor — and how to use it like solar tech for your body 🧊 Simple, science-backed winter protocols to stay tuned to natural rhythms — including outdoor exposure, infrared light, and the surprising benefits of staying cold 💡 Practical strategies for working with — not against — the seasons using light, timing, and indoor environment tweaks 🏙️ And why sunlight analysis, shadow mapping, and smart home orientation should be a priority in architecture, urban planning, and real estate designWhether you’re an athlete, architect, health hacker, or someone trying to shake off the winter blues, this is your blueprint for living in alignment with the original energy source of life: the Sun.🔥 Tune in and discover how to create your own seasonal protocol, master light exposure, and reclaim the natural intelligence of your biology, One Sunrise at a Time.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

What if your computer screen could heal you instead of harming you?In this episode of Sunlight Matters, we’re joined by Dr Peter Veto and Liliana Lettieri, the visionary team behind Pixun — a company pioneering solar-powered, full-spectrum displays that use real sunlight instead of artificial backlighting.Peter and Liliana share their personal journeys with light sensitivity, screen-induced insomnia, and EMF-related health issues, and how those struggles inspired them to engineer a radically new type of screen — one that brings the entire solar spectrum indoors using fiber  optics and rooftop solar collectors.We dive into:Why most screens today are making us tired, sick, and unfocusedThe science behind sunlight exposure, blue light toxicity, and circadian disruptionHow Pixun’s screens deliver natural light through displays, supporting everything from sleep health to vision and cellular functionReal-world applications for urban living, real estate sun studies, architecture, and workspace wellnessHow tools like shadow mapping and sunlight analysis can optimize solar collector placement for homes and commercial buildingsWhether you’re a parent worried about your child’s screen time, an architect exploring better building orientation, or a company looking to improve employee wellness through sunlight-optimized tech — this episode will change the way you think about screens forever.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

In this powerful and eye-opening episode, Dave speaks with Theresa Bug, a former German police officer turned online health coach, holistic nutritionist, and advocate for natural light, grounding, and mitochondrial health.🌿 Theresa shares her inspiring journey from a high-stress career in law enforcement—across Paris, London, Israel, and Africa—to deep healing through sunlight exposure, circadian rhythm restoration, and reconnecting with nature. Her story is a testament to the life-changing power of simple yet profound lifestyle changes.💡 Key Topics Covered:How chronic stress and PTSD led her to holistic healthThe science behind morning sunlight and mitochondrial functionWhy grounding (earthing) and going barefoot can reset your nervous systemThe truth about blue light, screen time, and modern lightingThe problems with supplement culture vs. real food and lifestyleHow to eat seasonally and locally for optimal health and gut functionWhy gyms might be harming us more than helping—and how to exercise in harmony with natureInsights into raw milk, hydration, EMFs, red light, sleep, and ancestral living☀️ This conversation explores how sunlight analysis, circadian health, and shadow-free living can transform your physical and mental health—especially in a world of artificial light, disconnected routines, and overprescribed medications.To find out more about Theresa, her Website is a great starting point: https://www.theresabug.com/homeor Linkedin: https://www.linkedin.com/in/theresa-christinerangebased/Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

In this illuminating episode, we're joined by Austrian engineer Viktoria Neumueller, a passionate advocate for sunlight-optimized architecture and energy-efficient building design. With a background in planning heating, cooling, and ventilation systems, Viktoria brings rare insight into how thoughtful building orientation and solar exposure can dramatically reduce heating costs, enhance comfort, and even transform quality of life.We dive deep into:Why shadow mapping and sunlight analysis should be a first step in architectural designHow ignoring solar orientation can cost homeowners thousands over a building’s lifetimeViktoria's personal mission to help homeowners, builders, and architects rethink natural light integrationThe surprising resistance from the construction industry—and how she’s challenging itWhether you're planning a new build, renovating a home, or simply fascinated by how sunlight and design intersect, this episode will inspire a new way of seeing your space.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

In this episode, Dave chats with Professor Glen Jeffery, a neuroscientist at University College London’s Institute of Ophthalmology, whose research investigates how light, particularly long-wavelength red and infrared, influences human health, metabolism, and ageing. Glen Jeffery is recognised as one of the world's leading researchers in exploring how light interacts with our bodies. Glen explains how sunlight penetrates the body, enhancing mitochondrial function, improving vision, and even boosting motor skills like grip strength. He warns that modern LED lighting, while energy-efficient, can harm metabolic health compared to incandescent bulbs that emit beneficial infrared light.They examine the public health consequences of our “infrared starvation,” the role of mitochondria in ageing, and the unexpectedly affordable potential solutions, such as rethinking indoor lighting and spending 20–30 minutes outdoors. Glen makes comparisons to historical issues like scurvy, emphasising the need for urgent policy reforms before our ageing, indoor-bound populations face worsening health crises. Practical advice includes seeking more natural light, using infrared-rich lighting where feasible, and adopting lifestyle changes that incorporate movement and sunlight exposure.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

Dave speaks with Dr. Nicholas Witton, a sleep medicine and light researcher, about the critical role of natural light, especially near-infrared (NIR) light, in human health.Nicholas explains how we've shifted from living outdoors to spending over 90% of our time indoors under artificial light, particularly LEDs, which emit mainly blue light and lack the full spectrum, including the NIR wavelengths that make up over 50% of solar energy.They explore how NIR light supports mitochondrial function, ATP production, and glucose regulation, with implications for metabolic health, sleep, mood, and performance. The conversation explores how modern lighting may contribute to chronic illness and what small changes—such as morning sun exposure or switching to incandescent bulbs—can make a meaningful difference.This episode reframes sunlight as essential nutrition, not just illumination. If you're interested in sunlight analysis, real estate sun studies, shadow mapping, or optimizing your home for natural light exposure, this is a must-listen.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

What if your home or office is silently shaping your health, your mood, and even your future? In this eye-opening episode, Dave sits down with Dr. Mandana Khanie, Lecturer in Health and Wellbeing in Sustainable Buildings at UCL and Deputy Director of the Light and Lighting MSc Program. Together, they explore how the architecture of our indoor lives, where we now spend 90% of our time, profoundly impacts our biological rhythms, mental health, and long-term wellness.Mandana shares her unique journey from aspiring medical doctor to architectural engineer, and why reconnecting design with natural sunlight is essential to reversing modern public health trends. They discuss cutting-edge research on circadian rhythms, the unintended health risks of LED lighting, and how built environments could be reshaped with real sunlight exposure, shadow mapping, and human-centric design at the core.This episode is a must-listen for anyone in architecture, urban planning, real estate, or simply passionate about wellness and sustainability. Tune in to hear how we can design buildings and cities that are not only energy-efficient but biologically nourishing.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

In this illuminating episode of Sunlight Matters, David Wallace is joined by Niko Gentile and Agnieszka Czachura from Lund University’s Energy and Building Design group. Together, they explore the science, perception, and policy around sunlight and daylight, and why we need to care more than ever.From the overlooked distinction between daylight and sunlight to the historical biases in building regulations, Niko and Aga take us on a fascinating journey. We discuss Agnieszka's new research into how people value sunlight in their homes today, revealing that although people still crave light, their reasons for doing so have shifted in our modern, thermally controlled, and urbanised world.We also examine how energy-efficient building codes risk undermining human well-being, why real estate agents might be the best sunlight psychologists, and how the physics of glass may be blinding us to the sun’s full health benefits.If you’ve ever felt better on a sunny day but didn’t know why, this episode is for you.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

In this episode of Sunlight Matters, Dave welcomes daylight and lighting expert Paul Rogers of ACC Glass and Facade Consultants. Broadcasting from Stockholm and the UK, they explore the profound impact of sunlight and daylight on architecture, urban planning, and human well-being. From the technical distinctions between daylight and direct sunlight to the emotional resonance of a well-lit home, Paul shares decades of experience shaping buildings around solar exposure. The episode touches on key topics like shadow mapping, solar orientation in real estate, sunlight in architectural history, and why tools like Shadowmap empower a new generation of homebuyers and city dwellers. An essential listen for architects, urban planners, sustainability advocates, and anyone curious about the sunlight in their lives.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

In this episode of Sunlight Matters, hosts Dave and Georg welcome Swedish sleep and light researcher Arne Lowden for a fascinating conversation about the science of light, circadian rhythms, and how our bodies and minds are profoundly shaped by solar exposure.Dr. Lowden, author of the book Survive the Winter, shares powerful insights into how lack of natural light affects sleep, mood, and long-term health, especially in northern climates. We explore the hidden costs of indoor living, the realities of “social jet lag,” and the rising demand for light therapy as a natural solution to Seasonal Affective Disorder (SAD).Whether you're designing a sun-filled home, optimizing your daily habits, or just trying to shake the winter blues, this episode offers practical, research-backed guidance to help you reconnect with the sun and realign with your natural rhythm.What We Cover in This Episode:Why sunlight matters for physical and mental healthHow snow cover increases daylight exposure in winterThe link between circadian rhythms and modern urban lifeLight therapy tips for beating seasonal depressionHow teenagers, shift workers, and the elderly are impacted by light deprivationThe role of architecture and home design in maximizing natural lightWhen to use blue light and when to avoid itIs red light therapy worth the hype?Why even 10 minutes of daylight in the morning matters.So find your spot in the sun, tune in, and give it a listen! Arne's book Överlev vintern, gives tips and advice on how to stay alert, sleep well and maintain a good mood even during the dark season. It can be  found here: https://www.bokforlagetpolaris.se/oeverlev-vintern/t-0/9789180662611Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

Welcome to the second episode of Sunlight Matters. In this episode, we explore the fascinating connection between real estate, artificial intelligence, and the importance of sunlight with Giulio, the founder of Masterkey. Masterkey is revolutionizing the home buying experience by giving buyers the tools to make more informed decisions through AI-powered property analysis.One of the most exciting features of Masterkey is its integration of sunlight mapping, a game-changer for anyone looking to understand how natural light affects a home. Sunlight plays a crucial role in real estate, influencing everything from property values to daily comfort and even well-being. In cities like New York where high-rise buildings cast long shadows, knowing how much sunlight a property gets can make all the difference.In this conversation, we dive into how AI is helping home buyers analyze properties more efficiently, why sunlight is a key factor in making a smart investment, and how tools like ShadowMap provide valuable insight into a home’s exposure to natural light. Whether you are in the market for a new home or just fascinated by the role of sunlight in urban living, this episode is packed with insights you will not want to miss.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe. 

In this episode of Sunlight Matters, host David Wallace interviews Georg, the founder and CEO of Shadowmap, a platform designed to visualize sunlight and its effects on various environments. Georg shares his personal journey, the technological innovations behind Shadowmap, and its applications in real estate and health. The conversation emphasizes the importance of sunlight for well-being and how Shadowmap can help users make informed decisions about property and solar energy.Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?Because sunlight isn’t optional. It matters.Please do not forget to Like and Subscribe.