The ARRI 1200/1800W Electronic Ballast with DMX and ALF is intended for use with the newly designed, more efficient ARRI M18 and Arrisun AS18 Fresnel lamp heads (not included). This ballast has DMX for precise remote control and ALF (Active Line Filter) which provides a higher Power Factor resulting in more efficient power use. This is accomplished by shifting the voltage and current waveforms in phase and minimizing harmonics and spikes. The ALF also minimizes the current carried back on the neutral leg of the power systems. Cable Loss Compensation, which prevents power loss in head-to-ballast cables up to 300' (91 m) long, is also featured. The ballast has a low-noise switch and a power factor of 0.98.