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Two leading makers of lighting products are showcasing LED bulbs that are bright enough to replace energy-guzzling 100-watt light bulbs set to disappear from stores in January. The new bulbs will also be expensive - about $50 each - so the development may not prevent consumers from hoarding traditional bulbs. Osram Sylvania said it has overcome the heat problem and will be showing a pear-shaped 100-watt-equivalent LED bulb at Lightfair. It doesn't have a firm launch date. Lighting Sciences Group Corp. will be showing several 100-watt-equivalent prototypes, including some that solve the problem of cooling the LEDs by using microscopic devices that move air over the chips, like miniature fans. Before the 100-watters, there will be 75-watters on the shelves this year.