Abstract
Application specific LED packaging (ASLP) is an emerging technology for high performance LED lighting. We introduced a practical design method of compact freeform lens for extended sources used in ASLP. A new ASLP for road lighting was successfully obtained by integrating a polycarbonate compact freeform lens of small form factor with traditional LED packaging. Optical performance of the ASLP was investigated by both numerical simulation based on Monte Carlo ray tracing method and experiments. Results demonstrated that, comparing with traditional LED module integrated with secondary optics, the ASLP had advantages of much smaller size in volume (approximately 1/8), higher system lumen efficiency (approximately 8.1%), lower cost and more convenience for customers to design and assembly, enabling possible much wider applications of LED for general road lighting. Tolerance analyses were also conducted. Installation errors of horizontal and vertical deviations had more effects on the shape and uniformity of radiation pattern compared with rotational deviation. The tolerances of horizontal, vertical and rotational deviations of this lens were 0.11 mm, 0.14 mm and 2.4 degrees respectively, which were acceptable in engineering.
Highlights
Light-emitting diode (LED), with increasing luminous flux and lumen efficiency in recent years, has more and more applications in our daily life, such as road lighting, backlighting for#116454 - $15.00 USD (C) 2010 OSAReceived 1 Sep 2009; revised 19 Oct 2009; accepted 19 Oct 2009; published 4 Jan 2010 18 January 2010 / Vol 18, No 2 / OPTICS EXPRESS 413LCD display, headlamps of automotives, interior and exterior lighting, etc [1,2,3]
We demonstrated a practical design method of compact freeform lenses, mainly focusing on eliminating deteriorations caused by extended sources
Illuminance distribution is not uniform enough within the whole subrectangular radiation pattern, it is already acceptable for road lighting in engineering
Summary
Light-emitting diode (LED), with increasing luminous flux and lumen efficiency in recent years, has more and more applications in our daily life, such as road lighting, backlighting for#116454 - $15.00 USD (C) 2010 OSAReceived 1 Sep 2009; revised 19 Oct 2009; accepted 19 Oct 2009; published 4 Jan 2010 18 January 2010 / Vol 18, No 2 / OPTICS EXPRESS 413LCD display, headlamps of automotives, interior and exterior lighting, etc [1,2,3]. Smaller, smarter and cheaper are development trends of both LED packaging modules and luminaires [3]. In LED applications, secondary optics are essential for most LED luminaires because radiation patterns of most LEDs are circular symmetry with non-uniform illuminance distribution, which cannot directly meet the requirements of specific applications Freeform lens is an emerging optical technology with advantages of being high design freedom and being precise light irradiation control, which are useful for LED lighting design [4,5,6,7,8]. Traditional freeform lens, due to the category of secondary optics in nature, has disadvantages of large size in some space confined applications, possibly resulting in large volume and weight of both thermal management part and luminaires, relatively low system optical efficiency and inconvenience for customers to assembly
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
