Freeform lens design for LED illumination with high uniformity and efficiency

Wei-Chung Chen; Hoang Yan Lin

doi:10.1117/12.893489

23 September 2011 Freeform lens design for LED illumination with high uniformity and efficiency

Wei-Chung Chen, Hoang Yan Lin

Proceedings Volume 8123, Eleventh International Conference on Solid State Lighting; 81230K (2011) https://doi.org/10.1117/12.893489
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

In this paper we design a freeform lens according to the LED light distribution curve so that the light rays emitted from a LED through the lens can achieve high uniformity and efficiency on the prescribed target plane. Because the model is of rotational symmetry, we consider just a 2-D lens shape and then sweep to get the 3-D result. Here a procedure based on the Snell's law and edge-ray principle for designing the freeform lens is proposed. First of all, we analyze the LED intensity distribution and subdivide it into parts. Then we calculate the zones on the target plane where the subdivided light rays should be distributed to. Finally we use an approximate analytic method to construct the freeform lens. After constructing the freeform lens, we simulate for the optical model by using the ray-tracing software LightTools^®. The simulation results show that the Cree XLamp XR-E LED light source through the freeform lens can achieve up to 94.8% uniformity and 89.1% efficiency including Fresnel losses for a 1 m distance away and 1 m radius of circular illumination plane.

Citation Download Citation

Wei-Chung Chen and Hoang Yan Lin "Freeform lens design for LED illumination with high uniformity and efficiency", Proc. SPIE 8123, Eleventh International Conference on Solid State Lighting, 81230K (23 September 2011); https://doi.org/10.1117/12.893489

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available