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"On days when I don't get my dose of sunlight, I use a daylight lamp that I sit in front of for at least 20 minutes. Often as much as an hour." Does the sunlig

• marvin 4y ago
  No idea; the effect seems similar but I do prefer the real sunlight for some reason. The lamp has the advantage of being easier from a time-management perspective though; I don't actually have to stop working and so on to use it. But I don't think that attitude is conductive to point B; taking extra care with work-life balance, getting enough exercise and decompression and so on, so I have a low threshold of just dropping what I'm doing and taking a break in the daylight :)
• wafflemaker 4y ago
  Sun, even on a cloudy day gives more light measured in lumens than even strongest lamps. Windows filter a lot, so being outside is important. You can use Lux Light Meter app to measure light intensity. Went outside to compare app results: Not too bright living room - 10lux Brightly lit kitchen - 400 lux. Outside (it's 15:45 in Norway, already getting dark), cloudy late autumn day/early evening - 50lux (which doesn't really prove my point :/) From memory: Sunny day, direct sunlight - 40k lux Cloudy summer day - 10k lux. A window filters 50-80% You see that even on a cloudy day you get as much as sitting 20cm from a SAD lamp. With 10k lux you need approximately 30min exposure before 9 o'clock to keep circadian rhythm from drifting.