Sign & Digital Graphics

December '14

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28 • December 2014 • S I G N & D I G I T A L G R A P H I C S ELECTRIC SIGNAGE "The color binning for white LEDs has improved, and we have a spread of color temperatures from 2400K up to and above 8000K," says Quaal. "We have all the color temperatures we need in a white LED. When there are skin tones and warmer colors involved, warmer whites may be used to get better color rendering. We offer white LEDs in 5000K for those who want to pull out warmer colors, like reds and food images, but most are using 6500K for general sign lighting applications." John Allgood, president of US LED in Houston, estimates that 90 percent of the LEDs the company sells for sign applica- tions are white, and most of the rest are red. Red continues to be the preferred backlit source for red sign faces, while blue and green are used very rarely for sign faces that are the same color as the light source. "You get a pink tone if you use white LEDs with a red face, but the amount of red we sell is way down from five to seven years ago, and white is way up. LED manufacturers have come out with a variety of elegant solutions for sign-specific applica- tions, such as large cabinet signs. (Images courtesy of Sloan LED)

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