This Invisible Light Restores Your Mitochondria (Science-Backed)

Light as Food: How Your Indoor Lighting Affects Your Health

This video features Dr. Paul Saladino (a physician) and Tristan Scott (an electrical engineer) as they investigate the biological impact of different light sources. Using a spectrometer and flicker meter, they compare natural sunlight, candles, LED bulbs, and incandescent bulbs to demonstrate how modern indoor lighting—which they characterize as "processed light"—differs dramatically from the "whole food light" of the sun. The video argues that light is not merely for vision but functions as a vital nutrient, and that the widespread adoption of LED lighting may be contributing to sleep disruption, eye strain, headaches, and metabolic dysfunction.

The Sun: The Gold Standard of "Whole Food Light"

The outdoor sunlight measurement serves as the baseline for all comparisons. The key findings include:

• Full spectrum composition: Sunlight contains everything from UV and violet through all visible colors to red and infrared, with over 50% of its energy in the infrared range.
• No flicker: Natural sunlight is a continuous wave, causing zero neurological stress.
• High intensity: Even in shade, sunlight measures around 10,000 lux, far exceeding any indoor environment.
• Infrared as a nutrient: Infrared light penetrates deep into cells, supporting mitochondrial function and triggering melatonin synthesis within the mitochondria—which helps counteract the oxidative stress caused by blue and UV wavelengths.

The presenters emphasize that infrared acts as a balancing mechanism, cleaning up reactive oxygen species created by shorter wavelengths. This balance is absent in most indoor lighting, creating what they describe as a cellular energy crisis.

The Problem with Modern Windows and LED Bulbs

The video identifies two major culprits in modern light environments:

1. Low-Emissivity (Low-E) Windows

• These energy-efficient windows block most infrared light beyond 850 nanometers.
• This shifts the ratio of blue to infrared light dramatically, creating an imbalanced spectrum at the cellular level.
• Even sitting by a window indoors means receiving "partially processed" light.

2. LED Bulbs: The "Processed Food" of Lighting

• Standard warm-white LEDs show a characteristic blue spike at ~460 nanometers with no infrared output whatsoever.
• The spectrum is narrow and unnatural, lacking the full range humans evolved with.
• Flicker is a major issue: LEDs driven by the 60 Hz power grid turn on and off at 120 Hz, which the brain and nervous system perceive even though the eye cannot see it. This can cause eye strain, headaches, migraines, and anxiety.
• The video includes a clip from the Huberman Lab Podcast where a researcher compares the health threat of LED light exposure to asbestos, citing animal studies showing mitochondrial damage from isolated blue light.

The presenters also test a "zero flicker" red LED bulb, finding that while it has less flicker, it still uses high-frequency switching (3,000–5,000 Hz) and produces an unnaturally narrow monochromatic spectrum. They advise avoiding dimmable LEDs entirely.

Better Alternatives: Candles and Incandescent Bulbs

The video presents historical and practical alternatives to LEDs:

• Candles: The spectrum is dominated by red and infrared light with minimal blue, making it non-disruptive to circadian rhythms and calming to cells. This represents the lighting humans used for roughly a million years.
• Incandescent bulbs: Described as "fire in a bottle," these produce a full, continuous spectrum with significant infrared output. They have minimal flicker (only a small AC ripple from the power grid).
• Red incandescent bulbs: The preferred solution for nighttime use. These use red-tinted glass to filter out high-energy visible wavelengths, leaving mostly red and infrared light. This provides the least circadian disruption while maintaining the benefits of full-spectrum incandescent technology.

The presenters recommend using amber or red incandescent bulbs in the evening to support sleep onset and wind-down routines.

Fixing Your Phone and Computer

The video concludes with practical advice for reducing the harm from screens:

• iPhone analysis: The screen shows three spectral peaks, including a significant blue spike at 460 nm, with no infrared. OLED iPhones (iPhone 11 and later) use pulse width modulation at ~400 Hz, causing flicker that can trigger headaches and eye strain in sensitive individuals.
• The fix for blue light: Navigate to Accessibility → Display & Text Size → Color Filters → Color Tint, then slide the tint all the way to the right. This produces a narrow red spectrum, similar to a red LED, which is much less disruptive at night—though it does not fix the flicker issue.
• MacBook comparison: The 2022 MacBook Pro has a similar blue-dominant spectrum but uses LCD technology with much higher frequency modulation (10,000–15,000 Hz), making it significantly less problematic than OLED phones. The same accessibility color filter trick works on macOS.

The Cumulative Impact of Poor Light Environments

The video highlights that Americans spend 93–96% of their lives indoors, meaning most people are constantly exposed to imbalanced, flickering light. This creates a scenario where individuals may be "nutrient deficient" in light—lacking the infrared that supports mitochondrial health and cellular repair. The presenters suggest this could explain chronic fatigue, headaches, and the need for multiple cups of coffee to get through the day.

Key Takeaway

Light is a biological nutrient, not just a visual aid. The modern shift to LED lighting and low-E windows has created indoor environments that are spectrally imbalanced (blue-heavy, infrared-deficient) and flickering, potentially contributing to sleep disruption, eye strain, headaches, and mitochondrial dysfunction. The solution is to treat light like food: prioritize natural sunlight exposure (even in winter, even in shade), use incandescent or candle lighting in the evening, and apply color filter settings on phones and computers to reduce blue light exposure. Small changes to your light environment can significantly improve sleep quality, hormonal balance, and overall health.