The result is a relatively warm light, between 3, 000 and 4, 000 kelvin, that generates more than twice as many lumens per-watt as Philips' current LED bulbs.

ENGADGET

This is a redesigned, 60-watt-replacement LED bulb that uses less power than the 13 watts of the company's current equivalent bulb.

WSJ: The Digital Solution: The Brightest, Most Efficient Bulbs