HERO-LED BG4EX-5T-WW Extended Back Pin G4 LED Halogen Replacement Bulb, 1W, 10W Equal, Warm White 3000K , 5-Pack(Not Dimmable) 5 pcs T3 G4 Base Bi Pin JC LED Halogen Xenon Replacement Bulb 1W Consumption 10W Equivalent 100 Lumens LED G4 Replacement Bulb For use in Ceiling Lights, Pendant Lights, Desk Lamps, Table Lights, Puck Lights, Under-counter Lights, Closet Lights, Under-cabinet Lights For use in Accent Lights, Display and Landscape Lighting, RV Motorhome Caravan Automotive Marine Boats Yachts Applications Not dimmable, don't work with dimmer switch. Warm White 3000K. Don't use electronic transformers. LED bulbs work perfectly with iron core transformers.