The ETC Source Four PAR Medium Flood Lens is an interchangeable optical component designed to shape and broaden the beam output of Source Four PAR fixtures. Classified as a medium flood option, it produces a softened field with increased spread while retaining the directional character typical of PAR lighting. The lens is used to adjust fixture coverage without changing the housing or lamp, making it practical for fine‑tuning wash distribution across stages, cyc walls, and performance areas. Commonly installed in theaters, touring rigs, and educational venues, the Medium Flood lens allows designers to balance beam width and intensity when standard narrow or wide lenses are not an ideal fit for the space or throw distance.