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Compared with an incandescent, the Infina LED Bulb is the same size and shape, but heavier and more solid, with a tad warmer light. It screws into standard fixtures, turns on instantly, and is dimmable. It comes in 40- and 60-watt equivalents and costs from $10 to $20. The company claims a 25,000-hour service life. Switch Lighting, 888.978.4110,