The GTR Lighting Ultra Reverse light bulbs are the brightest plug and play back up lights on the market today. Coming in at 1,200 lumens per bulb, they are brighter than most factory low beam headlights. Whether you are backing a boat down in the water, lining up to a trailer hitch, or even backing out of a parking space at night, these bulbs are an insurance that you will see what’s coming. Power is nothing without control! These bulbs illuminate from all four sides, and have a projector lens on the top edge, which makes them superior to alternatives because of the variety of ways in which bulbs can sit within their reflector housings. No matter if the bulb comes in from the side, or from the back of the housing, this design ensures that the output will be maximized through a combination of reflected light (from your housing) and projected light (from the bulb itself) With the Ultras new convection cooled design, the thermal capabilities of the heat-sink on the base of the bulb have been vastly improved, ensuring that these bulbs run cooler, last longer, and work more reliably throughout the course of their life. Their universal design and fool-proof install make these one of the easiest upgrades possible! When we think about lighting upgrades to enhance the safety of our cars & trucks at night, we always think about headlights and fog lights. Dont underestimate the luxury of improved rear-ward visibility though. This is overlooked far too often, but once you get used to having a set of these in your backup lights, youll literally see what youve been missing all along. The Ultra Reverse Light’s will be a direct plug and play replacement for the following part numbers: T15, 194