yes sir senorx you are right there is no 600w MH hahaha there's is a 175w,250w,400w and 1000w guess you fry your bulb buddy, same shit happen to me too last week, but i save my ass cause the old man i was settin up a room for plug my 400w hortilux blue bulb into a 1000w ballast but i jump over the trays and reservoirs to push him off and unplug it in like less then 3 second, the shit did fire up but got lucky didn't burn