Led Sidelit Channel Letters Signs are similar to full-lit channel letters, just with one more metal/stainless steel on the face which will stop face-lit. Also we can use dark colored acrylic or power coated acrylic as the material on the face to stop light coming out, which only make the sign light from the side. So it is called sidelit, or edgelit. This kind of sign has a softer and brighter light than led backlit. If you don’t like frontlit, it is a good choice.