Sign & Digital Graphics

September '19

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S I G N & D I G I T A L G R A P H I C S • September 2019 • 69 "A 24V carries more power, therefore will produce more light," says Christina Farmer, Director of Sales Support, US LED. "Some LEDs only work with 12V and some only work with 24V." Popular thought tells sign makers to use lower voltage with channel let- ter projects and higher voltage in more demanding projects. "For everyday channel letters, there is really no need to pay a premium for a 24 V system," says Bryan Vincent, Partner, Principal LED. "In linear sys- tems, like our Street Wrap II, a 24V system is preferred due to the long run lengths. In sign cabinets, it depends on where the power sources need to be mounted and really comes down to an overall system cost." With channel letters and sign cabinets being two of the most popular LED appli- cations, voltage becomes a question dur- ing design and implementation stages. "Channel letters are more often than not one- to three-stories high before you have to really worry about brightness being an issue," says Farmer. "You want more efficient modules that are bright for channel letters. Conversely, cabi- nets typically require significantly more modules, have the potential of being hundreds of feet in the air, and need to be illuminated in such a way that makes it noticeable to pedestrians on the ground. To achieve this, we want a module with more lumens which requires more watts per module and more space on a power supply." The power supply is also a point of consideration, which will ultimately serve as the driver of the LED lighting that regulates the power to the LEDs. "With 24V, you could benefit from the fewer power supplies or when a higher efficacy is demanded from the end-user," tells Bluhm. Rob Riley, Sign Channel Territory Manger, Keystone Technologies shares that "depending on how big the channel letters, and if you want a power supply in each letter, (that) may lend to a 12 V system." But as a general rule, "The sys- tems out there pretty much determine what voltage their products run on," Riley continues, "so, if you are lighting a product that requires 12V you would use a 12V power source, and if your lighting a product that requires 24V you would use a 24V power source." "We are having great success with the Sign Hero product, which runs on 120V/277V for cabinet lighting, replacing older, less energy efficient Fluorescent T12HO lamps," says Rob Riley at Keystone Technologies. Lighting a product that requires 12V, sign makers would need a 12V power source; and a 24V product would use a 24V power source. Image courtesy Keystone Technologies. As rule of thumb, 12V systems typically fit well in channel letters whereas 24V systems pair with sign cabinets. Image courtesy GOQ LED AMERICA.

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