I'm looking at this light for my 600w HPS lights: SuperNova Aluminum HPS or MH Reflector [REFSN] - $89.95 : AeroponicsNmore.com, For all your Growing needs! Everything looks great except the flange size: 4". Is a 4" fan enough to cool a daisy chain of lights adequately? I'm not sure how big my setup will be yet but I'll probably have 4 minimum, 8 max.