Sylvania 58633 - 37 Watt - MR16 - Tru-Aim IR - Flood - Glass Face - 5,000 Life Hours - 1,300 Candlepower - 12 Volt
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50 watts of light for 37 watts
It does what Sylvania says as far as efficiency goes. An additional benefit is reduced waste heat and cooler fixtures. I seems to last its 5000 hr rating. My only con would be that its light may be slightly pinker on the very edge of its illumination circle than a 50 watt standard MR16 was.
June 7, 2011