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500 Watts of light is not the same across the board. The ballast drives the lights and each type of ballast has it's efficacy levels. Metal halide's draw more in amps compared to a fluorescent ballast at the same lamp wattage. You will be using more electricity to drive MH vs T5's/PC's. Then you have to factor in lamp heat etc....
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Rich
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"Am I not destroying my enemies by making friends of them?" Abraham Lincoln
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