hi Denise...I too am searching for information regarding backlighting dimensional letters with electro luminescent lighting . I am surprised not to find much on here but was wondering if you had any luck figuring out any of it and if so would you share any reliable source of information? I am trying to get a customers job quoted and I think EL lighting is the best option but I am not 100% sure as it is for outside. I thank you for your time! Lori