This is a B&H exclusive Arri Compact 1200 Watt HMI Kit.
It is based on the lightweight, aluminum Arri 1200 watt HMI Fresnel. The fixture sports a 6.9" lens that 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.
Rounding out this kit are a 50' head-to-ballast cable, a four-leaf barndoor set and filter frame. An HMI bulb must be purchased separately.