Plug-in LEDs

May 24, 2007
What is said to be the world's first LED that runs directly from ac power comes from Seoul Semiconductor Co. Ltd. in Korea.

The company's Acriche LEDs provide warm-white light suitable for indoor lighting. A luminous efficiency of 42 lumens/W is 20% more efficient than conventional warm-white dc LEDs. Actual system efficiency — corrected for luminous efficacy, ballast efficiency, and luminaire efficiency — is 39.9 lumens/W. By comparison, actual system efficiency for incandescent lamps is 7.5 lumens/W, and 30.6 lumens/W for compact fluorescents.

The so-called color-rendering index (CRI) is a measure of a light source's ability to produce vibrant colors on objects receiving the light. A CRI rating of 100 is equivalent to daylight, while a CRI near zero suggests colors appear unnatural under that particular light source. Acriche warm-white LEDs have a CRI of 90. The LEDs last 35,000 hr compared to 1,000, 3,500, and 8,000 hr for incandescent, halogen, and fluorescent lamps, respectively.

Seoul Semiconductor Co. Ltd.,

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