Maybe if you didn't start out your thread sounding like a thief, more people would be willing to help you. I'm not saying you did or didn't, but if shit is in fact stolen, shame on you... maybe try it out when you are responsible enough to pay for your equipment. If not, I apologize and a ballast is responsible for turning 120v into like a thousand volts that are needed to make the light work. You have to have a ballast to make all hid lights work. bulbs have to match the ballast in order for the chemical reaction inside the arc tube to work. I.E., 250w bulb with a 250w ballast.. high pressure sodium bulbs will not normally work in a metal halide ballast. You have to have conversion bulbs to do that.