The most common light-related health problems that most people are already familiar with are vitamin D deficiency (from too little UV light) and circadian rhythm disruption (from too little blue light in the morning, and too much artificial light at night). Just these two light-related health issues alone are responsible for a massive burden of disease in the modern world. These two issues caused by inadequate and improper light exposure are linked with dozens of types of cancer, as well as heart disease, obesity, diabetes, neurodegenerative disease, and multiple other conditions.
