Sign & Digital Graphics

October '17

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20 • October 2017 • S I G N & D I G I T A L G R A P H I C S ELECTRIC SIGNAGE the hole to be located near the middle of the module or may even require two holes, one on each end, in order to securely mount the module flat to its mounting surface. Mounting of LED sign modules made specifically for double-face cabinets can be a little trickier. A variety of designs have surfaced that minimize use of tools and tedious hand labor to install double- face sign modules. These include: • LED sticks made in lengths equiva- lent to a fluorescent high-output lamp and that retrofit into existing fluorescent sockets • Lattice-style of LED modules that can be hung from the top of a cabinet • LED modules with tool-less click and play mounting accessories. Each has its own unique benefits, and they all are designed to minimize time and labor required for installing LED modules in cabinet signs. The RetroRayz fluorescent LED replacement stick system from Agilight. (Image courtesy of Agilight) Comparing 120° Lambertian light distribution with 155° "Batwing" light distribution from lensed LED. (Charts courtesy of OSRAM) 120° Lambertian Light Distribution 155° "Batwing" Light Distribution From Lensed LED. Other Design Features Protection of an enclosure against ingress of dirt or water, according to the International Electrotechnical Commis- sion codes, is defined in IEC 529. LED sign modules designed for outdoor or potentially wet locations often have IP (Ingress Protection) code ratings of IP 66, IP 67, or IP 68. The first digit in these examples being a "6" means the enclosure is dust proof. The second digit deals with water ingress where a "6" means limited ingress from high pressure hose down, a "7" means handles temporary underwa- ter immersion up to one meter deep, and an "8" means permanent high pressure immersion. Either IP 66, IP 67, or IP 68 are generally good for a vast majority of outdoor wet location environments and are readily available. Internal thermal management, or the ability of the design of the sign module to remove heat from the discrete LED chip, helps keep the LED cool, aiding in life performance and/or allowing for higher ambient temperature applications of the sign module. Material selections are also impor- tant in product design. For example, heat and/or UV light from the sun can degrade materials causing them to change color A blue LED module from US LED, and a red LED module from OSRAM. (Images courtesy of US LED and OSRAM)

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