A channel letter sign is a type of illuminated, three-dimensional signage where individual letters are constructed and then lit, often with LEDs. They are commonly used for business facades to spell out a company name or logo. These signs can be customized with different fonts, colors, sizes, and lighting effects. 

Here's a more detailed breakdown:

• Construction:

  Channel letters are typically made of aluminum for the frame and can have acrylic or aluminum faces. 

• Illumination:

  They are often illuminated with LEDs, which can be mounted internally. 

• Types of Illumination:

  • Front-lit: The letters are lit from the front, making them visible during the day and night. 

  • Halo-lit (Reverse-lit): The letters are mounted with a gap between them and the wall, and the light is directed to the back, creating a halo effect. 

  • Open-face: The letters have an open face, allowing passersby to see the lights inside. 

• Installation:

  Channel letters can be mounted directly to a wall, attached to a raceway, or mounted on a backer panel. 

• Customization:

  They offer a high degree of customization, allowing businesses to tailor their signage to their specific needs and branding.