I think the reason Envirolites may be cooler is just because of the watts per bulb. If you made a 400, 500, 1000 watt Envirolite, one bulb, not say 9 to add up to close to 1000, it may be just as hot. So the reason 9 Envirolites may be cooler is because of the expanded area involved. 9 lights spread over an area not just one spot of light/heat.

As for having the 125 watt Envirolite 1/2 inch from your plants? Maybe you can do that same thing with a 125 watt mh/hps. I don't know. Is 125 watts 125 watts and the heat is the same no matter it being a cfl, mh, hps? Or does the mh/hps inherently produce more heat than a cfl?

Inquiring minds want to know!!
Marc Benson Reviewed by Marc Benson on . Places to purchase low watt HPS. I was just wondering where one would go about buying a low watt (150 - 200 watt) HPS light. Mail order is not an option. Also, my grow room is about 3 x 2.5 x 9 ft. Would a lower watt HPS create to much heat? I have no way of venting excess heat. I plan to grow only 2 - 4 Northern Lights with these and I'll be using a few fluros with the HPS, if I can get it. Rating: 5