I was reading something that quite impressed me, and I want to hear from our experts here about this subject. Everyone knows that 75-85 is supposed to be the optimal grow room temp. This guy, who is an industrial grower, said that this temperature was arrived at over time, because any higher than that, and your HID or HPS will burn the top of the canopy. It is approx. 10 degrees hotter under the light (say, 12-16 inches), thereby making the temp of the canopy 85-95. So, anyone who has their thermostat set at 75, and has been successful, was really maintaining an 85 degree canopy temp. He has gone to all LED’s, and he suggests that the most optimal temp for LED rooms is 85-95, as there is negligible heat coming down off the fixture. He reckons that the higher temp = more transpiration, ergo more movement of fluids through the girls, and so on. Like exercising, if you will. It would really be sweet to hear from Robert on this one, but please, anyone, share you thoughts on this idea.