The unbalanced, short-wavelength-heavy spectrum of common LED lights, which lacks counteracting long-wavelength red light, may cause systemic mitochondrial dysfunction. Some scientists believe this is a major public health issue with a potential impact comparable to that of asbestos.

Incandescent and halogen bulbs provide a full, sun-like spectrum of light that supports mitochondrial health, unlike spectrum-limited LEDs. Using a dimmable halogen lamp, even at low brightness, provides ample beneficial infrared energy. This simple, low-cost switch can counteract the negative effects of modern indoor lighting.

Beyond creating Vitamin D, sunlight has a direct cardiovascular benefit. UV light triggers the conversion of nitrogen compounds in the skin into nitric oxide. This molecule enters the bloodstream, causing arteries to relax and subsequently lowering blood pressure, providing a clear biochemical mechanism for sunlight's association with lower mortality rates.

A landmark study by Roger Ulrich found that post-surgery patients in rooms with a view of trees recovered about a day faster and required less pain medication than patients whose rooms faced a brick wall. This provides strong evidence that even a passive view of nature can have significant, measurable effects on physical healing.

Long-wavelength light (red and infrared) is not blocked by skin or even bone. It passes through tissues and scatters internally, affecting mitochondria throughout the body. Experiments show that light shone on a person's chest can be detected coming out of their back, confirming deep-body penetration.

Contrary to the dominant narrative focused on skin cancer risk, emerging research shows that higher sunlight exposure is linked to longer life and reduced all-cause mortality, particularly from cardiovascular disease and cancer. The key is to get regular sun exposure while strictly avoiding sunburn.

The restorative effects of nature can be accessed even without being outdoors. Studies show that incorporating elements like artificial plants, nature sounds, or nature-themed art into indoor spaces can improve cognitive performance and well-being. This is a practical strategy for 'naturizing' offices, homes, and hospitals.

The push for energy-efficient LEDs came at a biological cost. These bulbs save energy by omitting parts of the light spectrum, like infrared, present in natural sunlight. This results in an unnatural, blue-heavy light that fails to provide the full-spectrum signals our bodies need to regulate circadian rhythms.

Mice living under standard LED lighting develop significant health problems, including fatty livers, smaller kidneys and hearts, unbalanced blood glucose, and anxiety-like behaviors. This suggests the unbalanced light spectrum in modern indoor environments may have profound, detrimental systemic effects on mammalian health.