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David_Gerard comments on My simple hack for increased alertness and improved cognitive functioning: very bright light - Less Wrong
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Good stuff. i recommend daylight-spectrum CFLs - about £5 each off eBay for 22W (100W-equivalent), compared to £2 in the shops for the horrible yellow 22W. I fill my house with these, and they really are just so much nicer than anything that isn't daylight-spectrum.
I have the alzo 45w and they're not that bright. You might want to try the higher wattage ones.
We since got five 30W (allegedly equivalent to 150W incandescent) 6400K bulbs and it's just lovely. Really increases my alertness for work-at-home days.