i hear hamilton has nice bulbs, but i wouldn't buy any ballasts (magnetic) from them. you can buy the ballasts from home depot for about one fourth of the price. several years ago i bougth a
vho ballast from them, when i got it it was just a magnetech ho ballast that i could have bought from hd for way less. if you aren't scared of dyi lighting you can get almost anything you need at a local hardware store. i built a mh ballast for a friend a few years ago for about 70 dollars in material. anyway, i'm off topic. good luck with the replacement. i just got a bad xm bulb and they are replacing it for me.