摘要： A design of a compact bike head lamp meeting the K mark regulation based on a white LED by Cree XP-C is presented. The proposed design contains three parts, one is a parabolic mirror, another is a flat mirror and the other is a lens. The design performed a contrast of 66.7 across the cut-off line by the K-mark regulation, and a prototype fabricated by a simple CNC machining was measured a contrast of 12.4 across the cut-off line. The successful design requests the LED operated at only 1 W, and it enables an user to operate the lamp longer with energy saving. ► Applying 1W LED for bike head lamp meeting the K mark regulation. ► A special design for getting high-contrast ratio across the requested cut-off line. ► A compact prototype demonstrated the successful design. 出版者： Elsevier Ltd 出版日期： 2012-06-01 出處： Optics and laser technology, 2012-06, Vol.44 (4), p.1172-1175 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2011 Elsevier Ltd 識別號： ISSN: 0030-3992 識別號： EISSN: 1879-2545 識別號： DOI: 10.1016/j.optlastec.2011.09.017
