One of the ways -- if not the best way -- to track the progress of LEDs over the past few years has been through the metric of lumens-per-watt. As you can gather from the name this is an efficiency ...

Often when we write about LED light bulbs on SmartPlanet, readers write in to say they're still waiting for a 100 watt-equivalent version - something bright enough to read by, many of you note. A bulb ...