HPS lamps really have a low heat output compared to the lumens they radiate. My grow space is a little small bitch in a plastic cabinet. 250 watt for an area that's roughly 4x3x2.5 stays below 85 as long as I've got a fan blowing in there. Also, be reminded that the best bud in the world comes from around the equator, where the sun is most intense. not only will hps lights give the plants sort of a 'tan,' but they'll cook out a lot of humidity which will allow the leaves to become narrow and glossy (they don't need as much surface area to intake air and expel poisons since the air is lighter and circulating.) The gloss comes because you've convinced the plant it's a dry climate and it needs to produce those oils to avoid drying out. Final products will reveal that the narrow glossy leaves have more resin percentage than the broader leaves. thanx for your time