ok i had them under 3 cfl with equaled to 54w of true light but the output was 300w.
i now have them under 125w of m/h
if i was you id go for one of thos big cfl that is a true 200w of a 250w hps if you want sum big yeild jst make sure you have gd extraction
and the you only get the odd smell when waterd or touched