NAKED BULB NK-921-350WW LED Replacement EMI Suppressed Vented Bulb, Wedge T5 Base &ndash; i.e. (921 Type), 350 Lumen 8-20Volts Warm White 60,000+ hour life expectancy, made possible by Patented Vent System that allows the bulb to run cooler unlike others; 8-20 volts DC; the wide-range voltage is designed to withstand RV power fluctuations that damage other bulbs; The only LED Bulb that is EMI SUPPRESSED so as not to wipe out TV or radio stations; The Bulb base is a Wedge T5 Base  i.e. (921 Type); The Bulb base is a Wedge T5 Base  i.e. (921 Type);