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latewood Reviewed by latewood on . Ballast problems So, ive been running a Hydrofarm 400W convertible ballast light system for almost a year now, and i check on my girls today and find them in total darkness. Since the light from the power switch on the ballast was still on, i assumed my MH bulb burned out, but after i switched bulbs the HPS bulb didnt work either. So apparently something is wrong with my ballast. I bought this brand new, its run almost a year with no problems, and today its done. Is this common? I would assume most ballasts Rating: 5