Arri M18 1800W HMI. 
An industry workhorse, the M18 is an open-face, lensless fixture that combines the characteristics of a PAR and a Fresnel, creating diverging rays of light to produce a very crisp shadow. It can operate on a 20A circuit. This lamp has a beam angle (HPA) of 20 to 60° with a wide usable field angle. The lamphead is silver.