Our NEW Led Light unit is a perfect replacement for Halogen units. No more changing Halogen bulbs and listening to fans. This little unit can hold 500 0.75mm fibers. Produces rainbow effects and solid colors plus a few other cool pre-programmed effects. To turn on, push button once, to change speed of flash click button 2 times, to Dim or raise light output Hold button down then release. Settings are retained the next time the illuminator is turned on.