Cross Strait Conference: pick a lighting two times the optical design of LED street lamp lens

In the recently held the fifteenth session of the Straits lighting technology and marketing seminar, the theme of the conference is the hottest LED lighting, meeting two days in Tianjin city China gathered at the mainland, Taiwan's experts and scholars come together and enjoy the LED lighting technology this time the feast. In the General Assembly on the first appearance of the report is Dr. Jiang Jinbo from the Hong Kong Polytech University. Dr. Jiang Jinbo of Hong Kong Polytech University at the meeting to make a report to Dr Jiang "introduced" two optical design of LED streetlight lens as the theme in the report describes the design and focus of the two kinds of light LED lamp introduces optical freeform lens design an asymmetric light distribution. The first kind of LED street lamp uses the symmetrical total reflection lens or reflector cup, and the LED lens module is arranged on an arc surface to generate a rectangular light distribution. The introduction of total reflection lens can greatly improve the efficiency of light utilization, but the arrangement of the curved LED module makes the design and mechanical structure of high power LED more troublesome. Second LED street is taking a freeform lens can be non symmetric, rectangular light distribution directly from a single LED optical element complete. The LED module only has a rectangular lamp with a light simple arranged in a flat plate can be the LED street in the mechanical structure, heat, and power control is relatively simple, different grades and different road light pole height road lighting only need to increase the number of LED modules can be different. The free surface design is based on the principle of the edge ray expansion (Etendue), and a set of accurate calculation method of the nodes of the free-form surface control mesh is created. In the X direction, the uniform distribution of light in the positive and negative 60 degrees of the lens is generated, and a square light spot with uniform distribution in the Y direction is generated in a positive and negative degree of 30.

Source: China Lighting Network