An ETC Source Four Enhanced Definition Lens Tube – 36º is a fixed‑beam lens designed to provide a wide, soft‑edged light. The 36º beam angle works well for area lighting, stage washes, and front light from shorter throw distances, making it a common choice for theaters, houses of worship, and general stage illumination. Enhanced Definition lens tubes are designed to deliver sharper focus, better contrast, and more even light distribution, helping reduce color fringing and soft edges across the beam. This lens tube installs easily into compatible Source Four fixtures and allows designers to achieve clean, consistent coverage while maintaining reliability and performance.