By John Perry and Issac Hsu – For the last hundred years, the incandescent light bulb has been part of our daily lives. We don’t think much about it. Flip a switch and dark becomes light.
Technologies vying to replace incandescent include halogen, compact fluorescent (CFL), and LED.
Why are LED lamps still so expensive?
An LED lamp is a complex group of electronic and mechanical parts: LEDs, optical diffusers, heat sinks, and a switched-mode power supply (SMPS) to turn the 50 Hz to 60 Hz alternating current (AC) into constant direct current (DC) that is LED-friendly.
It doesn’t require much thought to imagine this is probably more expensive to make than an incandescent lamp — a lot more. more> http://tinyurl.com/ogmwusk