The retina and brain are the two parts of the human body that consume the most ATP and energy, which is why they are most vulnerable to mitochondrial dysfunction: when ATP production drops, neural tissues fail first.

The mitochondrial theory of aging originated in the late 1950s and is a solid, durable scientific theory—not a fad—that remains validated by evidence across decades of research.

Primitive cells billions of years ago had low energy and limited capability, but when mitochondrial bacteria entered cells and began providing energy, this enabled the development of complex life with mobility and the transformation of Earth's biosphere.

The primary recommendation for public health is to reduce blue light and increase red light in environments, rather than optimize across all wavelengths; Glenn states he would 'die happily' if able to remove blue and restore red, even without comprehensive full-spectrum replication.

Everything observed in fruit fly experiments translates to mouse experiments, and everything observed in mice translates to humans, suggesting a conserved biological mechanism across model organisms.

Aged fruit flies with impaired navigation and cognitive ability ('lost') show improved exploration strategy and reduced errors after red light exposure, indicating that red light improves cognition and spatial memory, not just motor function.

A critical barrier exists between mitochondrial light researchers and lighting engineers: mitochondrial researchers request invisible infrared light (beyond 700nm) that provides no illumination benefit, requiring lighting engineers to invest in costly technology for effects they cannot see, creating economic disincentive for adoption.

Bright outdoor sunlight in June reflects infrared light when it touches skin (you don't feel heat because infrared is being reflected rather than absorbed), allowing people to receive significant infrared exposure by walking in parks or natural settings.

Blue light in the 420-450 nanometer range discharges the mitochondrial battery by reducing ATP production and can increase the pace of aging and increase probability of death.

When humans are given a baseline measurement of color detection threshold and then exposed to a burst of red light (670 nanometers), their ability to see colored letters against background noise improves within 3 hours, with blue target detection improving by 17% and red target detection improving by 12%.

ATP (adenosine triphosphate) is the form of liquid energy that the mitochondrial battery produces, and it is continuously produced, degraded, and regenerated in the body—humans produce roughly their own body weight in ATP each day.

Different wavelengths of light penetrate the body to different depths: ultraviolet light does not penetrate deeply (which is why sunburn occurs on skin), while longer wavelengths from 800-900 nanometers penetrate deeply through the entire body and can be measured exiting the opposite side.

In natural sunlight, there is a rough balance between blue and red wavelengths, and disruption of this balance—such as overexposure to blue light without corresponding red light—has consequences for human health.

Mice exposed to 670 nanometer red light show almost double the ATP levels in their cerebral cortex and significantly increased ATP in the thalamus (deep brain region) compared to control animals, demonstrating that infrared light can increase energy production in the brain.

Bee hives transported in trucks for almond pollination in California suffer a 4% loss of hives due to stress, but installation of red lights in these trucks has reduced hive loss by approximately 70%, providing practical evidence of red light's protective effect in a real-world agricultural application.

Incandescent light bulbs (used until the mid-1990s) had a spectrum very similar to natural sunlight with large amounts of red and infrared, meaning that people living indoors with incandescent lighting up to the mid-1990s were receiving adequate red/infrared light exposure despite being inside.

BMW laser headlights have a very narrow, intense blue peak that, if someone is caught in the beam, causes noticeable physical effects within 3 minutes, indicating the potential harm of intense blue light exposure.

When humans are exposed to 450 nanometer blue light, their heart rate shoots up and blood pressure drops significantly, representing major acute cardiovascular changes that have never been studied for long-term consequences.

The red light effects in laboratory experiments are subject to 'enormous slop in the system'—meaning there is wide tolerance for variation in dosage: 3 minutes of red light works as well as 20 minutes, and effects are all-or-nothing switchlike rather than dose-dependent, unlike pharmaceutical dosing.

Glenn acknowledges he does not understand why red light effects show this switchlike, all-or-nothing pattern with broad tolerance, despite finding this puzzling for a long time, but feels compelled to move forward with public health applications rather than continue mechanistic investigation.