CroLED® 10 G4 Bulb Spot Warm White 5050 SMD 12 LEDs 12V DC
I am very happy with these LEDs. Power good (fairly close to a 20W halogen), hot enough white. While the rendering is not as nice as a halogen lamp, but the same goes for LED lamps 10 times more expensive. I have tested it on a 12V battery that's OK,