THe photo shows an example of GemLite formed plastic 3 dimensional channel signage. It uses LED lighting which is energy efficient and has a long life expectancy (4 year warranty). As you can see, it doesn't have to be just letters - logos work great too!
To see more examples of channel logos and letters, click here
Backlit sign cans can be used for many purposes such as the menu board in the photo shown. They are available in a few sizes, can be double sided and the full colour digital prints can easily be interchanged.