The working environment for VMS is relatively harsh and equipment that is deemed "fit for purpose" is expected to last in this exposed, corrosive environment for a minimum of 10 years.
A lifetime performance of LED display can be tested through ISO 11997 (Corrosion) and ISO 4892 (accelerated weathering) test procedures. A successful performance in these tests would prove that a LED display is designed for such exposed and corrosive environment for a minimum of 10 years lifetime.
Resistance to environmental impacts of water and dust would be secured if the display would be hermetically sealed. It would assure stable environment for LEDs and driving electronics through entire display’s lifetime.
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