Underwriters Laboratories Inc. and ETL Testing Laboratories are organizations that
monitor and test the quality of various electrical devices. Because of their rigorous
testing methodologies, obtaining and maintaining certification can be expensive,
especially for semi-custom devices like LED billboards, which might be manufactured
to any number of different shapes, sizes and other specifications.
Some LED billboard makers offer an option for non-UL or ETL certified displays. These
displays are typically made with the exact same components on the exact same assembly
line, but are considerably less expsive because they do not need to be certified. However,
some municipalities will not allow for the installation of non-certified devices, so
they are not always a practical choice.
If the environment you will be placing the LED billboard in frequently reaches temperatures
of 95 F (35 C), the display will need an additional active cooling unit to keep the
LED lamps cool. Running the LED display at high temperatures considerably shortens
its useful lifespan.