even if the ambient temperature is high, it is still a LOT cooler than the lamp itself ... just think, if the plant was outdoors, in Mexico, Columbia, Thailand, etc.., it would be growing in 100+ degrees ... heat alone does NOT cause hermies, or every landrace strain would have died out thousands of years ago ... it is BEST to keep temps around 75, but not a matter of life-or-death ... :smokin: