The Universal Plate Series, often just called the Plate Series is primarily a retrofit light. It gets its name and its flexibility from the plate of metal upon which the lighting element is mounted. This plate can be sized to the existing shoebox or other housing and then installed directly into the existing fixture (after current bulb and ballast are removed, of course). Because the plate can be shaped to any existing fixture housing or can be mounted directly to other surfaces, this tends to be a very flexible retrofit design. Also, because of the simple design, it is relatively inexpensive to produce, which is good for everyone.