Cheap-ass HPS

yeah, they do look the same, but the end is much bigger than a normal one, and the threads are space further. and, personally, I'd never get a used bulb from ebay
 
I could be wrong but i dont think they plug into a regular lamp. Its hard to tell from the picture but a 400w bulb is big with a larger socket/ballast. Guess you could ask the seller before wasting your money. Definitely go new when buying lights.
 
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