LED (Light Emission Diode) Variable Message Signs (VMS) and displays are nowadays becoming irreplaceable part of modern intelligent traffic management systems.

LED technology is widely used in display and lighting industry due to versatility of application, possibility of pixel-level control, low power consumption, constant rise of LED performance and ever lower costs. However, probably the most important reason for LED technology domination in traffic visible solutions and its replacement of optic-fiber VMS technology, lies in long operating life time of LED as a light source and negligible maintenance during VMS life time.

After the first generations of LED VMS products have been in exploitation for some time one fact emerged. Luminance drops due to product aging, that were so large that VMSes become unacceptable for further active use, were observed after only few years of exploitation, which was significantly less than typically expected by the investor and declared by the manufacturers.

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