This is a dedicated, single function quartz halogen soft light, exclusively for use with many styles and sizes of softboxes that are capable of handling the heat of a 1000 watt fixture. It has an integral mounting ring that accepts the rods of a Dedoflex, Chimera, Photoflex, Westcott, or any other brand of rectangular, heat-resistant softbox.
The "Plus" signifies that its construction is more robust, and it has an intergral yoke to that end, unlike the more compact DLH1000S.