Abstract: In order to meet requirements of photometric performance of vehicle retroreflector, logn-range projection lighting source is designed to meet requirement of high uniformity spot on long-range illumination surface of test light source. Using reflective bowl xenon light source, light guide tube and collimator lens as design type, optical system can achieve effective use of light and long-range transmission, and can be formed at a distance close to parallel light irradiation surface. Besides, optical system is equipped with a rotary adjustment mechanism to complete continuous focusing function of lighting system and can realize continuous adjustment of uniform spot size on long-range illumination surface. On different irradiation surfaces with illumination distance of 30 m~40 m, this system can obtain different sizes of uniform spots, and spot unevenness is less than 5% in irradiation surface Φ250 mm ~ Φ300 mm.