Since day one I've been using a Sunlight Supply Maristar 72 inch 3X250W 4X39W T5 Metal Halide fixture with Galaxy Ballasts. Haven't had any problems.
I've changed up my bulbs quite a few times. Started with Ushio 14K, then tried Phoenix 14K then cheap eBay 15K bulbs. All worked just as well. The Phoenix bulbs were my favourite but a bit pricy. Current eBay bulbs are cheap and work just as well but don't last as long.
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