I was going to say the first thing would be to change the bulb, I run mh and hps fixtures in the parking lots of the buildings I take care of and 8-10 times its the bulb, however the humming sound from the ballast means that it's getting old and using more energy to fire the bulb keep your fingers crossed!!
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Always looking for the next best coral...
90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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