Not long ago neon was the only option for illuminating channel letters. Neon lighting consists of a glass tube which is bent to the shape of each letter and filled with a variety of gasses depending on the desired color. While neon still provides slightly greater brilliance in some colors, it is subject to dimming under cold conditions, typically requires more frequent maintenance, and requires greater amounts of energy consumption for illumination.
Light Emitting Diodes (LEDs) are small, low voltage lights that when connected in a series provide excellent illumination under all temperature ranges. LEDs are rapidly becoming the most popular form of channel letter lighting and are now specified by most national retailers. Not only are LEDs competitive to neon but they also require far less maintenance and energy usage.