Visible by day, luminous at night, channel letters provide great depth and precision to your company's sign. We offer a great selection of channel letters using a wide variety of materials and technologies to fabricate individual channel letters to achieve your desired effect. Channel letters are also known as "internally illuminated letters". This description says it all in that each letter is generally lit from the inside with light shining through the plastic sign face or out the back of the letter (called a halo-lit, or reverse channel letter).