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Design of primary optics for LED chip array in road lighting application.

Shang Wang¹, Kai Wang, Fei Chen

¹Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.

|July 13, 2011

Summary

This study introduces an optical design method for LED chip array packaging (LCAP) to achieve precise illuminance. The technique optimizes light distribution, enhancing uniformity and efficiency for road lighting applications.

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Area of Science:

Optics and Photonics
Illumination Engineering
Materials Science

Background:

Achieving prescribed illuminance in LED chip array packaging (LCAP) presents significant optical challenges.
Traditional methods struggle with uniform light distribution from extended sources, impacting lighting quality.

Purpose of the Study:

To propose an effective optical design method for LED chip array packaging (LCAP).
To improve illuminance and luminance uniformity for road lighting applications.
To enhance the optical performance and efficiency of LED luminaires.

Main Methods:

Developed a novel optical design method based on optimizing meshing parameters on the target surface.
Applied the method to design a primary freeform lens for a 16W LED package.
Utilized optical simulation to evaluate performance against established standards.

Main Results:

The designed lens demonstrated effective light energy redistribution for extended sources.
Achieved longitudinal uniformity of 0.7 and overall uniformity of 0.5.
Showcased a theoretical enhancement of 19.6% in relative optical efficiency compared to traditional optics.
Verified performance against Commission Internationale de l'Eclairage (CIE) requirements.

Conclusions:

The proposed optical design method is effective for achieving prescribed illuminance in LCAP.
The method significantly improves illuminance and luminance uniformity for road lighting.
The freeform lens design offers enhanced optical efficiency and meets stringent lighting standards.