Sign & Digital Graphics

September '19

Issue link: https://nbm.uberflip.com/i/1159106

Contents of this Issue

Navigation

Page 75 of 87

ELECTRIC SIGNAGE Other components of the lighting system, such as the diodes and actual design of the system can contribute to the voltage decision. According to Vincent, "It is important to note, that whether the system is operated at 12V or 24V, most LED chips operate around 3V. Sometimes, the LED manufacturer will put multiple chips in series or sell a mul- tijunction LED (for example three chips in series to create a 9V LED lamp). Modules are designed by creating a combination of lamps to achieve a desired input voltage. There is no fundamental efficiency benefit between a 24V versus a 12V system." Efficiency is a regularly addressed topic in LED sign projects, however, Vincent notes that higher voltage does not directly contrib- ute to a more efficient system. "In fact, the highest efficiency white LEDs (above 200LM/W) are typically at or below 3V operating voltage," he continues. "At Principal LED, we developed a new Stik product that utilizes one of these special LEDs to create a new 12V retrofit Stik that is 10 percent more efficient than the most efficient 24V systems. It all comes down to system design. The idea that a 24V LED sys- tem is somehow 'more efficient' than a 12V LED system is simply a myth." Bluhm contends, though, that "On 24V modules, it is possible to get more LED chips in series depending on how the LED forward voltages add up. More LED chips often trans- lates to more light output with the benefit of not using additional power with fixed voltage output power supplies." System Elements It is evident that more than one factor goes into determining the LED system con- figuration. As mentioned earlier, sign shops will need to take many things into consider- ation when offering a solution for custom- ers. Below are a few major elements that will come into play. Pricing Oftentimes, this is the most important question on the mind of the customer. Budgets can dictate purchasing decisions and sign makers will want to ask customers what they are willing to spend on a project. Principal LED has developed a new Stik product that utilizes one of these special LEDs to cre- ate a new 12V retrofit Stik that is 10 percent more efficient than the most efficient 24V sys- tems. In the past there were more than a few different system options; today 12V and 24V make up the majority of systems. Image courtesy of Keystone Technologies. Outdoor Dimensions in California used Principal LED's Qwik Stiks for this retrofit double-faced illuminated cabinet. Image courtesy Principal LED. (Below) "We have looked at com- petitive costs of a 24V, 96W single channel power supply, versus our 12V, 120W dual channel power sup- ply, (the costs) are very similar," says Bryan Vincent, Partner, Principal LED. 70 • September 2019 • S I G N & D I G I T A L G R A P H I C S

Articles in this issue

view archives of Sign & Digital Graphics - September '19