The aquatraders lights have gotten better. Had a buddy run his without the cooling fan for near six months before anything bad happened. Use the fan.
My friends and I have used ALL of their lighting types (PC MH T5) on various applications mainly planted tanks and reef though, and have had good results...go nuts. Treat yourself.
+1 to what heath said about the bulbs...they are ****ty. But thats what you get for a $9 MH bulb.