Reverse lit channel letters, reverse pan channel letters, back lit and halo lit channel letters. Are all the same thing. The reverse pan refers to the fact that the open side of the letter faces the Channel letters wall. The viewer sees a solid face which can be any color. Reverse lit, back lit, and halo lit refer to the illumination coming from behind the letter rather than from the face of the letter. The channel letters are mounted off the wall with studs or a raceway so the lights inside the can cast a glow around each letter from the back.