http://www.amazon.com/Interlux-DualARC-600W-HPS-Bulb/dp/B00GBTVG1Q/ref=sr_1_6?s=lawn-garden&ie=UTF8&qid=1398282857&sr=1-6&keywords=InterLuxPretty sure it says it's 600w. I too have a couple of 600's, a 1000 and 4 400w and a shit load of these yard lights lol. I never worried much about heat when...