✔Direct replacement for 912, 921, 922 halogen bulbs. USE for ceiling dome light (single or double). 921 LED Bulb, 12 volt led bulbfor rv interior lights, 921 LED | ✔One bulb has 38 induvial LED chipsets for better overall light emission and reduced hot spots. ✔2700K-3000K Soft White Light for arelaxing, everyday light. ✔Low power consumption measured at 3.8 Watts producing 600 lumens, equivalent to a 40Watt halogen bulb. | 【EXTEND BATTERY LIFE】Camp off grid longer and boondock your RV, Camper, Trailer, Motorhome, 5th Wheel and Marine or Boat. ✔Traditional halogen or filament bulbs frequently burn out becoming costly and time consuming to replace. ✔When hooked up to shore power, energy draw is only 3.8 Watts, measured at +/- .35 cents per bulb, reducing running costs. | 【LESS HEAT = COOLER CAMPER】Completely switch to energy efficient LEDs with reduced operating temperatures among all LED lighting inside your travel trailer. ✔NO more scorching summer days, relax better during summer nights, and NO more fan noise from your AC converter. | Safe, eco-friendly, No UV or IR radiation and longer lifespan,【1 Year hassle free warranty and satisfaction guaranteed! Or your money back!】