My 175W pendant heated my 40 gallon Hex up significantly. It isn't normally a problem, but when the room temperature also gets hot, I need a fan directed at the sump water surface just to hold temperature within tolerance.
No point in attempting to cool the light itself.
40 Gal Hex, 10 Gal Sump, CPR overflow with Mag 7 return, Maxxima 35 RO
, 10K MH
pendant, 2 x 15W actinic, 1 yellow tail damsel, 1 high fin goby, 40lbs LR
.com rock, 1 red head goby, 1 algae blenny, Leather, blastomussa, sun, and hammer corals, green polyps, carpet anemone, 2 sexy shrimp...and more LR
critters than you could imagine in your worst nightmares.... Mantis in 5 gal