Characteristics of Indoor & Outdoor Signs

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Why shouldn't I use an indoor sign outside?

An indoor sign should not be used in an outdoor application or a window application. First, the indoor sign is not bright enough to be seen in bright daylight. Outdoor signs should be at least 100 times brighter than Indoor signs. Second, the epoxy material that indoor LED’s are made of is not designed to be exposed to sunlight. UV light will turn the LED plastic dark within a relatively short time. The effect of this is to dramatically reduce the brightness of the display. If a sign must be read in daylight, it must use superbright LED technology that is designed for UV exposure. The brightness of each pixel should be at least 800 millicandela, and the brighter the better. Some of the brightest outdoor brightness signs are rated as high as 10,000 millicandela per pixel. Indoor signs usually have a brightness between 10 to 100 millicandela per pixel. Make sure that your sign is designed for an outdoor or window application.

Also, an indoor sign enclosure is not acceptable for an exterior application. The electronics of the sign must be protected against damage from heat, cold, moisture, and airborne contaminants such as dust, salt and smog components. If a sign is to be used in an exterior environment, it should have an exterior enclosure designed to withstand the weather and environmental conditions where it is being used. Don’t overlook sprinkler systems and maintenance workers that use high pressure water hoses to clean windows and fixtures. Every sign should be protected against moisture.