Hi,
I have four 400W metal halide fixtures at my church that run off of 220V. All wires from each fixture are tied together in one junction box and one 220V line is run back to a photocell mounted on the building. Over the past 5 years since the lights were installed, we have had to replace lamps numerous times and ballasts numerous times as well. I thought you could expect 2 or 3 years out of your lamps and even longer for the ballasts. My question is what could be causing this? I will tell you that I noticed that the original electrician installed a 110V photocell and is only switching one leg of the 220V, so the lights are always getting 110V. Could this be causing the problems? Thanks for any input.
