A-B1092098MA-AI BULB,LIGHT G.E. #921One New Aftermarket Replacement GE #921 Light Bulb This General Electric (GE) #921 miniature wedge base light bulb is a direct replacement for agricultural and construction equipment lighting applications. The 921 is a widely used 12 volt halogen bulb suited for instrument panel lights, interior cab lights, reverse lights, and auxiliary lighting circuits on tractors and other machinery. Specifications Bulb Number: GE #921 Voltage: 12. 8V Wattage: 18W