The Arri Electronic Ballast with ALF and DMX control for LTM 575, 1.2K fixtures enables DMX 512 dimmer control for the fixtures. The Active Line Filter contributes to more economical use of power. The A.L.F. system performs power factor correction to eliminate the phase shift between the voltage and the current sine wave. With unity of Power Factor the required apparent power is optimized to a minimum. Since electricity supply companies charge for apparent power, A.L.F. helps to save costs.