hey all... i scored a High Powered Sodium 490w 60Hz ballast with a 430 W Philips HPS bulb at a garage sale recently. The reason it was a at a garage sale is that the power supply line was cut. So i tried attach the power supply to a plug and tried it. the three wires in the cord were white (negative) black(posative) and green(ground). i assume.... but the ballast wouldnt work. ive tried bulbs i know work with it but all the ballast can muster is a slight buzz if you put your ear to it.... the company that makes the ballast is L.P. Light Systems on the sticker it says power requirements 277V 2.3 A i dont know if this is correct but i would assume so. im wondering how i can power it if it is getting insufficient power from a 120V outlet. I saw the ballast work but i didnt have the chance to see where the power cord went. any ideas?