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CS114 bảng dữ liệu(PDF) 3 Page - Lumileds Lighting Company |
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CS114 bảng dữ liệu(HTML) 3 Page - Lumileds Lighting Company |
3 / 4 page CS114 Illuminated Signs Case Study 20150330 ©2015 Lumileds Holding B.V. All rights reserved. 3 Sign of the Times With the basic concept in place, Silicon Constellations built a 1” x 1.5” light module consisting of a single cool white LUXEON Rebel LED mounted on a special board assembly that maximizes thermal dissipation and allows the body of the cabinet to be used as a heatsink. The module was named the Rebellious I™ after the LED that made it possible. Arrow Sign Company then used sample modules to build a prototype of the sign for evaluation by airport architects. A live demo in early 2008 included side-by-side comparisons of the Rebellious I and four competing LED modules. The visible dif- ference in performance helped seal the deal. “The Rebellious I was twice as bright as the other modules. That helped assure the architects that our signs would deliver brightness levels equivalent to the exist- ing signs,” said Charlie Stroud, CEO of Arrow Sign Company. “The lean look of the box was a critical design element for the airport architects, but it wouldn’t have mattered if we couldn’t also show that we could meet the brightness benchmarks.” Additional design and engineering support was provided by Future Lighting Solutions, the exclusive supplier of LUXEON LEDs. Silicon Constellations uti- lized Future’s proprietary Usable Light Tool to calculate how many LEDs would be required to light the signs. The firm also consulted with Future’s engineers to identify appropri- ate dimmable LED drivers and an optic vendor that could provide the elliptical optic needed for the airport project as well as a full range of other optic solutions to suit different applications for the Noveseo product. Lighting the Way The first Noveseo-powered signs were installed in fall 2008 in the airport’s outdoor ground transportation island. Like most of the approximately 300 signs which will ulti- mately be built to provide directional signage for airport visitors, the initial signs are 7 feet wide and 20 inches high, with two strings of seven Rebellious I modules running parallel to each other at the top and bottom edges of the cabinet. In total, then, just 14 LEDs were required to light a single seven-foot sign. Other form factors, both shorter and longer, will utilize the same parallel configu- ration with proportionately fewer or more LED modules based on cabinet size. LUXEON Rebel’s high flux levels coupled with the thermal management innova- tions of the Rebellious I module are allowing 12” placement between modules instead of the 2”, 4” or 6” intervals used in other LED products, both lowering material costs and simplifying the assembly process. Each sign runs at a constant current drive of up to 700mA, requires just 2.25 watts of power per module, and is designed to be dimmable by remote control using Mark VII wired or ZigBee™ wireless dimming controllers. With LUXEON LED technology leading the way, the signs also reduce energy con- sumption by more than 70% over fluorescent or neon backlight versions, further lower costs by lasting at least four times longer between bulb replacements, and provide a ROHS-compliant mercury-free and lead-free light source. Beyond those ‘green’ advantages that are often associated with solid-state light- ing applications, the major achievement of the San Jose airport wayfinding sign project remains the ultra-slim cabinet profile and the striking new look it offers for illuminated signage. Once again, Silicon Valley has given birth to technology and innovation that promises to spread around the world. The idea proposed to David Mastrandrea, architect at Jacobs Carter Burgess was to illuminate the signs from within by placing LED modules along the top and bottom edge of each sign and use an acrylic diffuser panel behind the sign faces; creating the same effect as a backlight without requiring space in the cabinet to mount a backlight panel. |
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