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LumiLeds Lighting launches multi-format Luxeon light sources (LED News)

LumiLeds Lighting has revealed details of its new Luxeon products, a range of high-power LED sources featuring large area die that can be driven at high currents (up to 700 mA). The company says the new chips offer up to 10 times the output of standard LEDs (see ). LumiLeds plans to introduce a series of light sources containing Luxeon LEDs in various configurations and colors this summer. The Star is a single-light source available with or without optics, while the Ring combines six or 12 white devices with optics and supplies up to 194 lm. The Line source, containing 12 white LEDs, is also rated at 194 lm, while the Flood system provides up to 324 lm from a small board densely populated with white chips. The sources are equally bright or brighter in other colors; the red Flood emitter is rated at 792 lm. "Until now, LED devices did not emit enough light to make an effective lighting fixture," said Mark Swoboda, vice-president of sales and marketing. "But with Luxeon producing anywhere from 10 to 20 times more light, we re now in the right ballpark for [general] lighting." LumiLeds is addressing color stability and reliability issues, including the perception that white LEDs lose 35% of their lumens after just 4000 hours. Failure mechanisms include epoxy yellowing, reflector cup and die-attach epoxy discoloration, phosphor degradation and reductions in LED die output. LumiLeds employs packages that do not contain epoxy or unprotected silver lead-frames, or reflector cups that might discolor. In addition, the die-attach is separated from the LED, ensuring that epoxy degradation does not affect the light output. As a result, long-term reliability data for the company s cyan LEDs show less than 20% degradation after 50 000 hours. LumiLeds believes that the white LEDs will maintain their high output for at least 25 000 hours. Getting the whites whiter LumiLeds has also looked at inconsistent lighting effects in white devices caused during conversion of blue LED emission by a phosphor. The correlated color temperature, or CCT, defines this characteristic. A poor CCT value results in different shades of white, and conventional light sources have a CCT range of +/50 K. Current white LEDs fall well short of this value with +/500 K. LumiLeds says its new white devices are rated at +/100 K, with +/50 K expected in future.
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