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I used them year's ago, in computers to cool cpu's it should allow you to use a smaller heatsink if you used a temperature probe...And an Arduino to power it and keep it at a set temperature sounds like it could be a good project to try.

Yes those, yes it needs a heat sink and a driver. but it would keep your light very cold so you could run it harder.

I do not know if any of you have looked at peltier's for cooling as I think they work well. What do you people think?.