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 Light

• Sunlight 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 Connection

• Mitochondria, 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 Light

• Modern 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 Debate

• All 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 Winter

• Use 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.