An ETC Source Four Lens Tube – 36º is a wide‑beam lens designed for short to medium throw distances where broad, even coverage is needed. The 36º beam angle makes it well suited for general stage washes, front light, and area lighting where the goal is to cover larger sections of the stage smoothly rather than isolate a single subject. It provides a clean, controllable field with good shuttering capability, allowing light to be shaped while maintaining soft edges and even distribution. This lens tube installs directly into compatible Source Four ellipsoidal fixtures and is commonly used in theaters, houses of worship, and performance spaces where flexibility and consistent coverage are priorities.