Confused with the jargon used in today’s signage industry? Do terms such as ‘cluster’ ‘contrast ratio’ or ‘refresh rate’ make you scratch your head? This glossary of terminology will help light the way to understanding many of the terms associated with Outdoor Digital Advertising.

To navigate through the glossary, click on the letter above to go directly to that glossary page.

[L]

LED BRIGHTNESS

The brightness level of an LED is measured in milli-candelas. The materials used to manufacture the LED determine the brightness of the LED.

LED DEGRADATION

The standard method used to express the life of a display is the time it takes to reach 50% of its day one brightness.

LEGIBILITY

The characteristics of letters, numbers, graphics, or symbols that make it possible to differentiate one from the other. See Conspicuity.

LIGHT DETECTOR

An electrical component used to detect the amount or level of ambient light surrounding a display. If dimming has been set to "AUTO," the light detector or sensor adjusts the intensity of the LEDs accordingly. Also called light sensor.

LINE OF SIGHT

The simultaneous viewing of more than one outdoor unit.

LISTED SIGN

A sign labeled to indicate that the manufacturer of the sign is identified in a list published by a National Recognized Testing Laboratory as producing signs in conformance with the applicable American National Standard.

LOCATION LIST

A listing of all locations included in a specific outdoor program.

LOGO

A design that represents goods, identity or service.