Abstract: A hollow colored translucent body member has an open base end arranged to receive a light bulb. Such base end has spaced slots and also has an outwardly turned flange arranged to be engaged between a bulb holder and an instrument in which the bulb holder is installed upon friction holding engagement of spring tabs on the bulb holder in outer defining portions of a bulb receiving aperture in an instrument to be lighted. The slots in the body member are dimensioned and arranged to receive the spring tabs on the socket end of the bulb holder. The slots in the base end of the body member have a longitudinal length greater than the length of the spring tabs on the bulb holder to provide air spaces for air circulation around a light bulb in the holder.