"Within the next several months, several of the world’s biggest lighting companies, including Osram Sylvania and Philips, will introduce LED replacement bulbs to various world markets, including the United States.
While the bulbs will be praised for their energy-saving characteristics and long lives, most consumers will immediately think, “These things look weird....
...Those funny fins are a “heat sink.” Because LED light sources generate all their heat through the rear, manufacturers are adding heat sinks to dramatically increase the surface area and let the heat dissipate rapidly. Without them, the LED fixture would lose its color accuracy and have a dramatically shortened life."
Photo of the SoL™ MR16 from Lighting Sciences