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    HID MH bulb works on HPS ballast??

    No its not. That's why I asked the question.
  2. F

    HID MH bulb works on HPS ballast??

    So I got a HPS 250 watt lamp. My bulb went out and I had a GE multivapor MH 400 watt bulb laying around so I stuck it in the place of the hps blub. It actually works. But I'm wondering....a few things. 1 is this dangerous? A MH bulb on a HPS ballast. And then what about using a 400 watt bulb on...
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