Diode Dynamics DD0168P Switchback BulbsUpgrade. Add a modern appearance to your vehicle with these replacement LED bulbs. These bright LEDs are available in a number of colors including cool white, to replace the factory yellowish incandescent bulbs. Brightness. All Diode Dynamics LED lighting is rated with accurate, measured lumen figures, not calculations or guesses. We test the true output in house, and provide you the real numbers to compare. Reliability. Unlike other bulbs on the