I have an old Ushio 10K, but it is quite old and finicky. It may fire up or not even with the right ballast.
Do you have any idea what the ballast is, most hydroponic ballasts are HPS or MH. Does the ballast have an ignitor and a cap or a cap only.
Ushio bulbs will fire up under a HPS ballast, and for that matter some will argue it's better for the bulb.
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-=Bryan=-
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