The other day i saw a water cooled light. It was running at an even 70 deg. w/ out a chiller. You would need a space for a 50 gal. drum though. I herd you can run these babies as cold as you want w chiller as long as you stay above your dew point. I gotta say i was unsure about them until i saw it in person. Now I can't wait to get one. xxx.westcoastgrowers.xxx