The second task is to develop a high-efficiency secondary optics to enable the illumination pattern to meet the K-mark regulation, where the illumination requirement is shown in Fig. 1. (Refs. 4 and 8). A general approach in projection lamp is to design a total-internal-refraction (TIR) lens.9- 11 In such an application, the volume of the TIR lens will be large and an aspherical surface or microstructure could be implanted on the exit surface to perform the cut-off line and requested pattern. The difficulty in mass production and high cost will make such a design impractical. Another design is to apply a multisegment reflector, where the drawback is low optical efficiency. In this letter, to achieve the contrast requested in the cut-off line, we design a light pipe with two horizontal parallel planar reflectors R3, and with two special slanted surfaces, R1 and R2, as shown in Fig. 2. R3 is used to reflect a part of lights to illuminate the roadway. The best shape for R1 is a planer surface and its tilt angle is about 45 deg from the z axis. The shape about R2 can be parabola or ellipse to provide a narrow light pattern along the y axis. The two slanted reflectors are used to build up a stripe illumination pattern with extreme high contrast. It is, however, the divergent angle in the horizontal direction that is too large to make enough illumination at the HV zone, which is the hot point in the regulation. To overcome this problem, a reflector pair near the LED is added as shown in Fig. 3, which is used to collimate the lights spreading in a horizontal direction. The combined structure is shown in Fig. 3. The size is about 35 × 35 × 45 mm3. The optical efficiency is about 80%. The diameter of the input aperture is about 8 mm and the size of the output aperture is 26 × 27 mm2. The simulated light pattern is shown in Fig. 4, where the illumination at the HV zone is bright enough and the contrast across the cut-off line is high enough to meet the K-mark regulation. After optimization, the contrast across the cut-off line is as high as 250, which is far larger than 5 as requested in the regulation. The contrast is the ratio of the illuminance at HV and the maximum at zone 1.