A reflector is an optical component that redirects light from the source into the required light pattern. Its shape and reflective surface influence beam width, intensity, uniformity, and stray light. Reflectors may be used alone or together with lenses and other optics. Different reflector geometries can create narrow, wide, asymmetric, or shaped distributions. Surface accuracy and reflectivity affect efficiency and control, while contamination or damage can increase stray light. A reflector’s performance should be judged as part of the complete sealed optical system, since the LED position, lens, housing, and aiming all influence the result.