Revolights are a set of LED lights arranged around a hoop that attaches to the front and back wheels of your bike. Lithium-ion batteries, bracket-mounted to the front and rear hub, supply power to the LEDs. The batteries can be charged via USB. Those batteries will keep the lights on for about 4 hours. There are 8 LEDs at 35 lumens, per wheel. The Revolights started out as a Kickstarter project a year ago, it was funded many times over. The company is now selling them at full retail price, which is $250.
Source / By Ben on Tue Nov 27 2012