This is an ARRI Compact 5750W HMI Fresnel Kit. It includes an electronic ballast, filter frame, and barndoor set.
The ARRI Compact 575W HMI Kit. The fixture provides a smooth, even field of light. Powering the HMI fixture is the Arri multi-voltage ballast. It has on-board dimming, offers flicker-free power, and can be connected to your control board for remote dimming.