Ming's Mark 5050173 260 Lumens Wedge Bulb 100,000 hours life expectancy 8-30 volts DC including 12v and 24v; the wide-range voltage is designed to withstand RV power fluctuations LED Replacement light bulb for bulbs with 921/T15 Wedge base Low heat, safe to touch, and instantly bright; turn to adjust the directional beam of light Energy efficient and eco-friendly