ARRI’s M18 HMI Lamp Head With ALF/DMX High Speed Ballast Kit (Multi-voltage) is an open-face, lensless, more efficient lamp head built to work with a new power class of lamp. DMX control and ALF (Active Line Filter) together produce much more efficient power use in an already very efficient lighting fixture. The M18 combines the best aspects of a PAR and a Fresnel, creating diverging rays of light to produce a very crisp shadow. This fixture is supplied for use with 90-125/180-250VAC. This lamp has a beam angle (HPA) of 20 to 60°, with a wide usable field angle.