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Baughn comments on My simple hack for increased alertness and improved cognitive functioning: very bright light - Less Wrong
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LED lights are currently very slightly cheaper than any other type of lighting, amortized over the full lifetime of the lights. It'll probably get better.
Accounting for future value of the money, of course, it's more expensive. I'll take that over having to keep changing the lights, though.
Also, if you buy RGB(W) LEDs and add some work, you can choose your rooms color temperature at will. Keep it at 6k if you want to work, let it shift gently to 2k3 to help with a regular sleep rhythm, make it turquoise for a party...