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These signs typically use a type of [[Fluorescent Light Technology]] involving high output fluorescent bulbs. Each Recessed Double Contact high output fluorescent bulb is held in place by [[Recessed Double Contact Lamp holder]] pairs, one having a spring. Bulb installation or replacement is made easy by pushing the bulb slightly in the direction of the spring socket, then moving the other end of the bulb outward.Face Panel: A flat face panel or pan face panel can be inserted as the front of the sign. Example of a pan face panel, which offers the advantage of attracting attention from the sides better than a flat face panel because illumination from the sides becomes possible.[[Image:lightbox_pan_face.jpg]]