Lighting Science Group. The company's Edison-based LED lamps fit into traditional recessed cans and other sockets, and come in cool white as well as warm white and in narrow- and wide-beam distributions. Aluminum fins, die-cast in a patented design, dissipate heat from the rear of the bulbs. The company says the lamps are more efficient than incandescents, halogens, and CFLs; their life span is eight to 25 times longer than halogens and incandescents and more than six times longer than CFLs. 877-999-5742.