Nilight 3157 LED Bulb 2PCS 57LED 6100K Cool White 3156 3056 4157 3057 Back Up Reverse Light Day Running Light Tail Light with Projector Replacement for Trucks Cars Motorcycles, 2 Years Warranty. Perfectly work as Reverse Back up Light, Day Running Light, Parking Light, Marker Light and Tail Light. LED bulbs have two brightness levels, with a high brightness of 4W and a low brightness of 1W. The blub run in bright mode when your original bulb socket only has single wire in one side, like 3155/3156/3156K.