Efficiency is the comparison of the amount of light (lumens) produced by a given amount of electrical energy (watts). The more the lumens per watt the more efficient the bulb.
Those with 2700 K are closest to incandescent bulbs; ones with 3000 K are similar ... The Cree Lighting 6 in TW Series 65W Equivalent Dimmable Retrofit LED Downlight is part of the Lightbulbs ...
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