HERO-LED  MR11-9T-WW MR11 GU4 LED Halogen Replacement Bulb, 12V AC/DC, 1.8W, 15-20W Equivalent, Warm White 3000K, 5-Pack(Not Dimmable) 5 pcs MR11 GU4 LED Halogen Replacement Bulbs 1.8W Consumption 20W Equivalent 12V AC/DC LED MR11 GU4 LED Replacement Bulb For use in Display Cases, Novelty Lamps, Tracking Lighting, Recessed Lighting, Hospitality Lighting, Residential Lighting, Spot Flood Lights For use in RV Motorhome Caravan Automotive Marine Boats Yachts Applications Not dimmable, please don't use it with a dimmer switch. Warm White 3000K. Don't use electronic transformers. LED bulbs work perfectly with iron core transformers.