I'm not talking about the ballast. This bulb works with all HPS ballasts. It's a modified MH bulb designed to work with HPS ballasts because HPS bulbs are traditionally orange-ish in hue. This bulb is white. Whiter than most MH bulbs in fact.
It turns out the guy who was telling me the Ushio 5200K bulb is compatible with MH ballasts is flat out wrong. This bulb is HPS only. Good thing I ordered the right one. Unfortunately, it's only 4000K. Maybe when I've got everything up and running for a while I'll buy an HPS ballast and get the Ushio 5200K bulb. It's supposed to have better whites. I can compensate to a degree with video card controls but I'd rather just have a better bulb.
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