I do during the winter and I find it to be effective. Certainly not like long summer days but I can tell a difference in mood and energy level when I use it regularly. I normally try for 2-3 hrs at my office deck or on an end table at home while watching tv or on the computer.

This is the one I use - http://www.amazon.com/...;keywords=blue+light

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I installed f.lux on my laptop. I feel sad in the afternoon when the light goes red, lol. I don't think it's a game changer but can't hurt!

Downloaded F.Lux. Pretty cool. What's the difference between candlelight, tungsten, halogen and fluorescent?

I think it's the amount of red v blue in the light. Candlelight is the warmest and dimmest (for evening), on up to brightest and bluest fluorescent.

I have the previous gen of this one http://www.amazon.com/...&keywords=golite .
Looks like they're only $20-30 on ebay now, wow. I live in the snow belt and don't use it religiously but it does give you a nice feeling. Not sure if it really helps with depression or not, but I like it. It's super bright! Glad you brought this up, I think I'll turn it on right now, lol.