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Old April 21, 2016   #21
Cole_Robbie
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Join Date: Jun 2012
Location: Illinois, zone 6
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Don't buy them. They are Mercury Vapor. It's the lowest efficiency of the high-intensity lighting types.

It's not that they won't work - they will - but you will burn a lot more energy than is necessary. A metal halide or high-pressure sodium would be much better. Some old indoor fixtures like those are metal halide. You can find HPS bulbs used outside for security lighting.
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