The tech behind backlit channel letters isn't complicated but requires precision. Aluminum boxes shaped like letters with solid fronts - brushed metal, painted, whatever. Inside each backlit letter, LED strips point backward at your building wall instead of forward. Turn them on, light hits wall, bounces back around letter edges. That's the halo people talk about with backlit letters.

LED positioning inside backlit channel letters separates quality work from amateur results. LEDs need exact placement - precise angles, precise distances from edges. Professional shops making backlit letters nail this from experience, avoiding bright streaks mixed with dim spots.