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Grothor comments on Stupid Questions August 2015 - Less Wrong
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Could putting an 850 nm wavelength LED light array on my forehead for ten minutes or so a day do me any harm? It generates a small amount of heat.
Edit: See this video for a motivation: http://selfhacked.com/2015/07/18/interview-with-dr-michael-hamblin-harvard-professor-and-infrared-therapy-expert/
After trying to imagine a way this would fail badly, I think you should make sure that whatever you do, you can remove it quickly. It's common for homemade electronics to get hot or catch fire, and you don't want to have any trouble getting if off your head if that does happen.