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electricity in an indoor greenhouse

Hi guys! I'm setting up an indoor greenhouse and was wondering how the grow lights will fare with the high humidity atmosphere inside the greenhouse. I am concerned about the electrical dangers as well as regular corrosion on the metal parts of the lights. Also, we don't keep that part of the house(spare room off of the garage) heated in the winter so I was thinking of putting an oil filled radiator space heater in there to heat it. How will that fare in the moist area? Thanx a bunch!

I've had a couple of mini greenhouses in my house for quite a while, with open-air lights inside for many months. They don't seem too affected by humidity, likely because the heat they will give off themselves drops the humidity around the lamp.