I would say it's the bulb, but I've seen these ballasts burn out before. I would try changing the bulb first, then I would try changing the ballast. Good Luck!
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90 gal SPS display+65 gallon mixed reef
GEAR: Korallin calcium reactor, bio pellets, digital aquatics controller, Tunze ATO, MP40, 4 x Tunze 6105 w/controller, Reef Octopus Xp3000 ext, 2x250w MH, Futura LED.
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