LEDtronics has announced a multiple voltage, Bi-Polar B321-XIW 9mm Miniature Bayonet based LED bulb designed to replace many ordinary incandescent bulbs. It was designed to directly replace 6MB, 44, 47, 755 (5/6 V) 12MB, 756 (12/14 V) 24MB (24 V) 313, 757, 1819, 1829 (28 V) 48MB (48 V) 60MB, 1835 (60 V) 120MB, and NE51H (120 Vac) incandescent bulbs.

The LED bulb comes in a T 3-¼ bayonet base that mounts directly into standard sockets.
ledtronics.com