Since the federal government mandated in 2007 that light bulbs needed to be 25 percent more energy efficient than incandescents, the industry has solved the problem by creating consumer-friendly light-emitting diode, or LED, bulbs. It used to be that all you needed to know was whether your lamp took 60, 75 , or 100 watts. Homeowners now are faced with learning a whole new lingo. The most common complaint against LEDs, and I share this one, is that the light emitted is too white. Correlated color temperature, or CCT, is a measure of how white the light is.
A homeowner primer on LED lighting
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