This the Eurolite theatre spotlight with 650W or 1,000W with Fresnel lens. The lamp can be easily moved in its housing, for optimally lighting the stage.
Briteq makes this 25-50 optics unit especially for their PROFILE160 spotlight. It is a professional theatre optics unit that has a zoom range between 25 and 50 degrees, and coated blades for minimum reflections.
The BT-PROFILE160 is available in two versions, and this is the 15 - 30 degrees type. It features an adjustable zoom function to light out smaller objects accurately.