Novel application-specific LED packaging with compact freeform lens

High power white light emitting diodes (LEDs) have begun to play an important role in many illumination applications due to their excellent performance. In this paper, an effective freeform lens design method for extended light source was suggested briefly for the first time and two compact LED packaging freeform lenses, with the material of polycarbonate (PC) and silicone respectively, were designed based on this method. Two novel application-specific LED packages, whose manufacturing processes are compatible with current LED packaging processes, were also presented for street lighting. By comparing with the traditional LED illumination module consisting of an LED and a secondary optical element, the novel application-specific LED package has the advantages of low profile, small volume, high light output efficiency, low cost and convenience for customers to use. Since the application-specific LED packages provide effective solutions to high performance and low cost LED fixtures, they will probably become the trend of LED packages.