What's inside the Samsung 40W-replacement-LED light?

摘要

In February 2010, EDN tore down its first LED bulb (Reference 1). For $20, you got a nondimmable bulb that produced 500 lumens at a cool white (5000K) and consumed 7W. The warm-white version of the light produced only 450 lumens. Two years later, you can buy this fully dimmable Samsung bulb for $19.95 (list price) that puts out 550 lumens of a nice warm white (3000K), consumes 10W, and boasts a five-year warranty.