Hey guys. Thanks for the input.

Update. I went to fetch my 150watt ballast and bulb (HPS) today, an when i got there the guy actually had MH. So he found a sodium one and gave it to me with a discount. Ended up payin about $12 for 100 more watts of HPS. 250watt... So i got home an now i dunno how to wire it... If i open the back there's space for wires, 2 have a n above, one has the earth sign and the other is blank. Any idea's what to do? Please help guys