I recently had the chance to test two state-of-the-art LED light bulbs fromEarthLED. LED bulbs have many advantages over incandescents and compact fluorescent: LEDs use very little power, they last 10 years or more, and they contain no hazardous substances. They are also tough: they can be dropped and turned off and on repeated without damage, they can operate in very cold or warm temperatures. They can also save you money in the long term despite costing $50 (for the 100 watt equivalent Evolux) and $90 (for the 60 watt equivalent Zetalux).