This 18-inch blacklight fixture and bulb with reflector will make fluorescent puppets, props, clothing, and more seem to "glow in the dark," allowing for terrific special effects. The auto-start feature means that this light turns on without delay. With this feature, these lights could be mounted from your lighting trees, or behind your puppet stage curtains, plugged into one source, and controlled with one on/off switch. We recommend one blacklight for every four feet of stage width. Replacement bulbs available separately.