I just bought a light fixture, the guy didnt know if it was an HPS or MHID, but its definatly one or the other, its a 250watt system, like what is way on the top of warehouses, came with a ballast ontop and everything, but it doesnt have a yellow tint like a HPS does, its more of a really fucking bright Floro color, so is it a Metal Halide?
Its a 400watt multi tap fixture, it came from a warehouse lighting place normal $200 but i got it for $30 cause the guy was replacing tge old fixtures and i just relized i could probably run the lightbulb serial code on Sylvania.com...
If its an old warehouse light it might be a metal halide. I`ve seen a bunch of those on Craigslist.org.