you definitely need a new light source! as far as the HPS (high pressure sodium) lights go, you CAN NOT plug them into a standard socket. they use a different size (mogul i think it's called) not to mention that you need a ballast. you can get some Y splitters and some CFL (compact flouroescent light) from walmart or homedepot etc. when you veg you want 6500 K, which lies on the blue end of the white light spectrum. the more light the better! also you need to worry about ventilation and whatnot.

like i said, read through a couple of the grow logs. as a matter of fact, go through my first one. you will learn plenty of what not to do!

-shake