I just bought a 250 MH bulb which was apparently drop shipped from Hong Kong. It appears to be okay but it won't light up. My question is this...Are there different types of bulbs with a mogul base? The one I purchased has an ANSI code of M58, its a type T-15 E39 mogul base. It is a little longer than my old bulb but not sure if that means anything or not. I have no idea of the specifics of the old bulb other than it is a 250w 14K Hamilton. The 250 watt ballast is home made and has no case, I think the manufacturer is Magnetek. Just wanted to find out if I some how got an incompatible bulb before I send it back to Hong Kong.