Fix Your Light Environment
Whole-food light vs. processed light, and how to rebuild a light environment that actually heals.
Companion to the healthy vs. harmful light video with Tristan Scott.
Whole-food light vs. processed light, and how to rebuild a light environment that actually heals.
Companion to the healthy vs. harmful light video with Tristan Scott.
“This is an issue on the same level as asbestos. This is a public health issue, and it's big.”Dr Glen Jeffery, Professor of Neuroscience, UCL, on the Huberman Lab podcast, “Using Red Light to Improve Your Health & the Harmful Effects of LEDs,” December 2025.
Seven common light sources measured side by side, so you can see exactly which ones reach into infrared and which ones stop dead at red.
Why low-emissivity glass strips 91% of the infrared at 850 nm, and why sitting by a sunny window still leaves you short.
The four whole-food light sources, ranked by when to use them: daytime indoor default, evening wind-down, and the one bulb for right before bed.
How to get the infrared back during daylight, and what to switch the house over to after dinner. Includes why dimmable bulbs make flicker worse.
The exact tap-by-tap settings for iPhone and Mac to strip the 460 nm blue, plus what a tint can't fix.
What to buy, what to avoid, and an eight-item walkthrough of your house you can finish this afternoon.
Board-certified physician and a leading voice in ancestral health, reaching millions through YouTube, Instagram, and his weekly newsletter. This guide is the companion to his healthy vs. harmful light video with Tristan Scott, where every reading you see here was measured on camera.
Light is food. There's processed light (LEDs and screens) and there's whole-food light: sun, fire, candle, incandescent. Better light means better sleep, better hormones, better everything. Start today.