The Arri M18 is an open-face, lens-less, improved efficiency lamp head built to work with the 1800W SE HMI (not included), which has an average life of 750 hours, a luminous efficacy of 92 lumens/watt, and a Color Rendering Index (CRI) greater than 90 at 6000K. DMX control and ALF (Active Line Filter) together produce much more effective light source in an already very impressive 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 90-250 VAC mains voltage. This lamp head has a beam angle (HPA) of 20 to 60°, with a wide usable field angle.