A 4” Deep LED Sign to Be Built in Mineta San Jose International Airport

How should the signage look like in the airport in heart of Silicon Valley? Jacobs Carter Burgess — the architectural firm overseeing the expansion and renovation of the Mineta San Jose International Airport — has come up with the idea of  a sleek, modern, eco-friendly sign design in a 4” deep sign cabinet—the slimmest double-faced illuminated sign ever produced.

The new signs have to be illuminated by power LEDs made from semiconductors from which Silicon Valley has got its name. And LUXEON® Rebel LEDs from Philips Lumileds installed in Noveseo™ LED light modules engineered specifically for the project by Silicon Constellations Inc will be utilized in the design. The use of solid-state lighting (SSL) also provides energy efficiency, long lifetime and other benefits to help reduce San Jose’s energy consumption and establish the region as a role model for sustainable development.

A perimeter lighting scheme was proposed to Jacobs Carter Burgess by Silicon Constellations and Oakland-based Arrow Sign Company which can cut the signage depth by 50% to a sleek 4” —precisely what the airport’s architects were looking for. The idea 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.

The challenge was to find an LED that would emit enough light from perimeter lighting without requiring too many LEDs or generating excess heat. The LUXEON Rebel product solved the problem with its minimum 100-lumen and market-leading thermal efficiency. It also offered other technical advantages, including the best lumen maintenance of any power LED driven at high currents—in this case, 700mA.

“We needed a combination of factors that included high flux, low forward voltage and peak thermal efficiency,” said Bojan Silic, founder and CTO of Silicon Constellations. “The minimum 100 lumen LUXEON Rebel was the only LED on the market that met all of our requirements.”

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 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 existing 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.”

The Rebellious I LED light modules used in the new wayfinding signs at the San Jose International Airport are ideal for applications ranging from illuminated signs to channel letters and cove lighting. They provide a high-brightness, high-efficiency lighting solution offering long service lifetime, advanced thermal management, minimum 100 lumen/watt performance, and the ability to be driven up to 1.0A and deliver 195 lumens in constant-current configuration. A 1W/module constant-voltage configuration is also available.

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