As lighting systems age the need for retrofits—namely where newer lighting technology is used to replace older or different technology, but where a direct replacement is not possible without some kind of modification to the rest of the lighting system—increases. The residential lighting retrofit market is well established with a one-for-one light source replacement approach that is widely embraced; for example, a table lamp with a failed incandescent bulb can be readily replaced with an LED bulb despite the disparate power requirements because of the onboard driver system, and this avoids having to modify the lamp itself, the outlet, incoming power, etc. No such solution exists for specialized lighting systems such as sports and wide area lighting systems. The present invention is directed to such a solution, and one which is cost effective, easy to implement, and customizable to meet the varying site requirements of such specialized systems.