Philips, the Netherlands-based lightbulb manufacturer who won a 2007 congressional contest to create an energy-saving replacement for the incandescent 60-watt bulb, plans to start selling their LED bulb (the "L bulb") in stores just in time for Earth Day, this Sunday.

It will retail for $60 at stores like Home Depot, with an instant $10 rebate to consumers, bringing the cost down to $50 for 30,000 hours of LED light. If used for four hours per day, that works out to 20 years of light! [ – Image via Yahoo]