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Why LED signs go dim

led signThe non-uniform aging, and dimming of LEDs is an inherent problem over time. Outdoor LED displays are a fairly recent addition to the electronic sign world. Improvements in brightness that first made LED signs competitive with incandescent displays did not occur until the early 1990s. Also, outdoor heat and humidity degrades the aluminum gallium arsenic (AlGaAs) diodes that were used in early LED sign models. Continue reading