Channel letters are custom-made metal letters commonly used as exterior signage on public and commercial buildings, and often internally illuminated.
Exposed neon channel letters are standard channel letters, but the neon is covered with a clear acrylic face to keep birds from making a nest as well as to protect the exposed neon from outside elements, i.e., weather, etc. This allows for the exposed neon to be seen, as well as the inside of the channel letter interior itself to add to the dimensional look.
Back (Halo)-lit or reverse-lit letters are constructed from aluminum and the lighting is directed to the back. This light floods the wall that the letter is mounted to and creates a negative space at night. Letters in this style are also called halo letters. LEDs are installed to the inside back of the can, and the back is often fitted with a clear or translucent plastic back to diffuse the light and protect the lighting elements and wiring. The letters are typically mounted 1-1/2″ from the wall so they are set off from the façade of the building. The inside of the can is often painted white to reflect light. The effect of the halo lighting allows for a variety of creative effects depending on the color, sheen, and texture of the building surface. Light-colored building surfaces with a matte finish produce the best halo effect; dark mirror-like finishes the worst.
Channel letters may be flush mounted (attached directly to the building facade), or they may be mounted on a raceway. A raceway is a rectangular mounting structure which serves as both a container for the sign’s electrical components (such as a power supply) and a mounting structure.
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