The ARRI 300 Watt Plus Fresnel is designed to gather as much light as possible and direct it through the 3.2" (80 mm) low-expansion, borosilicate fresnel lens producing a soft, even field of light. The yoke allows it to be attached to any 5/8" stud. Beam angle in the flood position is 49 degrees and a narrow 15 degrees while in the spot position.