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Actually, I have a customer that was using about a 20% under rated bulb in a MH ballast. They were replacing all the lighting (for floros) and was thinking of snatching a light or two but they were 277V with no extra taps. Think it was 320W in a 400W ballast. Forgot the numbers, but something like that
But with an electronic ballast, I don't see why the MFG's can't add this to the mix. Its got a brain to regulate (and the sales pitch of keeping lumens constant over the life of the bulb) and can handle HPS & MH. so why not handle under rated bulbs?
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