For softboxes only! The Dedolight DLH1000S Tungsten Soft Light Head is a single-function quartz halogen light, to be used with softboxes capable of handling the heat of a 500- to 1000-watt fixture. A variable-size mounting ring accepts Dedoflex, Chimera, Photoflex, Westcott, or any other brand of rectangular, heat-resistant softbox. A protective glass tube is included.