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If you have a possibility to throw out the hot air right outside, I mean the building itself, that could help with heat build up. Extracting fan must be high capacity. Extracting air from the tent into the room won’t help at all. Even with windows open. The most effective cooling is surely air conditioner. That’s expensive though.

You will need a cooling system for that lamp with a extraction fan. HPS are not best temp wise in small spaces in my opinion.