One of the toughest parts to swallow of LED lighting technology is just how costly it can be. Well, the folks at Cree have taken umbrage with that and developed a bulb that'll retail for around $5 per 40- and 60-watt equivalent bulb -- less than some standard CFL lamps by a few bucks. How's it doing that? In part by changing the bulbs' design and eliminating the need for heat sinks. As IEEE Spectrum reports, instead of the collar that more or less does double duty holding the LEDs in place and dissipating heat, the new models get rid of hot air via convection. Meaning, as diodes get warmer they naturally draw cool air in from outside the bulb as the higher temperature rises upward and outward.