Seems to me just the removal of of heat buildup would remove so much heat emissions from the lights, that running cool air through them wouldn't add too much. I could easily be wrong though. Has anyone noticed a significant drop in temperature (5+ degrees) in the grow room itself when converting to water cooling or chillers?
No Personal experience butt..... I kno someone who uses a water chiller and his 1000w HPS is only 3-4 inches above his foliage with no burn or withering while my 250 MH would burn my hand at 6 inches. The shop I go to has them for a resonalbe price I think their largest one is like $350.