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cold light?

peoplesuck

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This is my last post for a while and i was interested in if cold light is possible?(not a bulb) i asked my science teacher and she said that she doesn't think it is until we are able to control nitrogen. I dont know much about this topic and couldnt find much so if this is a stupid question, sorry.
 

Cognisant

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LEDs don't heat up as far as I know.
 
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