Now you afford an inexpensive light unit with single color for you Fiber Optics, it's Coolglow(tm). The light unit is completely cool because it runs off a newly designed MR16-LED bulb. The bulb contains 12 LEDs and operates from 12 vdc.adapter. Entended for Endglow Fibers only NOT Sideglow. If ordering Out of the USA please look under our Electronics section and order the Universal AC adapter.