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saturn comments on My simple hack for increased alertness and improved cognitive functioning: very bright light - Less Wrong
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"Equivalent watts" is not a well-defined unit and the figures given by manufacturers are often exaggerated. Real incandescent bulbs vary in light output per watt. It's easier to use lumens, which are additive. However, human brightness perception is logarithmic, so 4 times the lumens will appear less than 4 times as bright.