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.
The Cree Lighting 6 in TW Series 65W Equivalent Dimmable Retrofit LED Downlight is part of the Lightbulbs test program at Consumer Reports. In our lab tests, Lightbulbs models like the 6 in TW ...