The Lighting Handbook
The cones come on during the day and we see colours, whereas at night the rods take over and we only see shades of grey. What is the melanopic effect of light? The retina also contains photosensitive ganglion cells. These are sensitive to blue light and suppress the sleep hormone melatonin at night. Melatonin is responsible for a good sleep at night. Suppressing melatonin in the morning helps ...