Oddbean

The blue light receptors are in the bottom of your eyeballs, outside your field of vision. They are also much slower to respond than the visual retina. Thats why people tend to not notice things overhead. Bluelight (scarcadian rhythm) therapy would only work if the lights are on the ceiling. If you want something useful, make an infrared sauna with a real wood stove, use it in the evening. Also, don't fucking use sunscreen, just stay out of direct sunlight when the sun is between the 10 o'clock and 2 o'clock positions (rule of thumb, lower latitudes may be more hours). All this gallium aluminum arsenide semiconductor light is questionable at best. Nobody has done the most obvious study: measure melatonin blood levels in reaction to different monochromatic light. Digikey has hundreds of different wavelwngtg near-IR LEDs available. The melatonin kit is under a thousand dollars and the microvile chromatic measurememt device is basically free on ebay.