Your sign can be illuminated in many ways, through the use of back lighting and face lighting techniques. The main picture shows a back illuminated sign panel on a coated aluminium box, the smaller pictures show LED's + trough lighting providing halo and downlight. L.E.D.'s are becoming increasingly popular. The life time costs using LED's compared to other methods of illumination are often significantly lower.
Typically less energy is required to power LED's compared to other light sources. And with fewer maintenance visits required it's easy to understand the advantages of new technology illuminated signage supplied by AAA Signs of Gateshead.