A candelabra-base bulb is a light bulb with an E12 base, which is slightly less than 1/2 inch in diameter and approximately 5/8 inch tall. It is the base manufacturers use on many holiday lights and for most night-lights.
The candelabra base is popular for use in many small, decorative lights. Some ceiling fan manufacturers use this type base in their products. Candelabra-base bulbs are available in several styles, including incandescent and florescent lamps. Options for the bulb shape include the C7 shape, which is approximately 2 inches long, and the picture bulb, which is long and very thin. Some manufacturers use it on low-wattage antique-style bulbs with filaments that glow orange.