As you can see in this selection from around the world below,
Light is very important element from every illuminated sign in order to be visible. During the years different sources of light have been used for signage needs.
10 years ago most of the channel letters and light boxes were illuminated with neon or fluorescent lamps, because LED technology was still not efficient enough to provide the amount of light needed. Now we use mainly LED for all our channel letter signs and many of the light boxes.