220 volt keeps your ballasts a bit cooler which is the only reason it saves energy. Not worth setting up for a cabinet as the convertor is expensive and uses energy itself but my strung out point is they are designed to run at that temp. Like simon said keeping it cooler is better for it and it will work longer. I used home made ballasts that had no cover on them. It keeps the insides cooler but do not touch the wires. I had a bit of a problem with that. The 1000 watters make your arm go numb for a second.

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c