The Light Doctor by Dr. Martin Moore-Ede reveals how modern artificial lighting—especially blue-rich LED and fluorescent light at night—disrupts circadian rhythms, suppresses melatonin, and drives chronic diseases like cancer, metabollic and cardiovascular disease). The book argues that light is as essential to health as food, air, and water, and we must design and choose lighting in ways that align with human biology (i.e. “circadian lighting”).