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Underpowered MH ballast


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What sort of issues might arise from running a MH with an underpowered ballast? It's a 250w, but the ballast is only pulling a PF of .67 (around 170w-174w). What issues might I see if I continue using it? Shorter bulb life? Reduced color temp? House-fire? From reading about it, it seems like there are probably a number of underpowered MH ballasts being used out there, so I was thinking it probably isn't a huge issue.

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just buy a 175w bulb. or sell the 175w ballast for $40, and buy a new 250w ballast for $100. why risk something as serious as 'electrial fires' when it can be easily prevented by spending a few $$

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