Photobiomodulation, the use of specific light signals to stimulate cellular recovery, is emerging as a promising area of scientific research. Researchers in Grenoble have developed devices aimed at harnessing this technology, though it has already been misrepresented as a "miracle cure" by some non-experts. Current theories suggest that longer wavelengths of light, such as those found in natural sunlight, may help restore mitochondrial membrane potential, which is crucial for cellular energy production. In contrast, shorter wavelengths like those emitted by LEDs might reduce this potential. This hypothesis requires further testing but integrates various existing data. Additionally, experts note that excessive exposure to short-wavelength light (UV and blue light) from artificial indoor lighting can be detrimental, likening it to consuming empty calories. While some UV exposure is necessary for vitamin D synthesis, most indoor environments are overexposed to short wavelengths and deficient in longer wavelengths. Related health concerns such as brain fog and fatigue have been linked to mitochondrial health, with interventions including creatine supplementation, red light therapy, and promoting angiogenesis being suggested. Anecdotal evidence also indicates that increased morning sunlight exposure can improve sleep quality and stabilize circadian rhythms.