Green LongLife 5050131 LED Replacement Light Bulb Tower with 921/T15 Wedge base 250 Lumens 12v or 24v Warm White 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 Energy efficient and eco-friendly