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

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Abstract

In this study, we proposed an effective optical design method to solve the problem of prescribed illuminance for LED chip array packaging (LCAP). With this method, light energy redistribution can be obtained by optimizing meshing parameters on the target. Not only can it deal with light controlling of extended source, but also improve the uniformity of both illuminance and luminance for road lighting as well. As an example, we designed a 16W LED packaging with a smooth primary freeform lens for general road lighting. The simulation results demonstrated that optical performance of this lens can meet the requirements of Commission Internationale del'Eclairage (CIE) quite well. Longitudinal and overall uniformities are 0.7 and 0.5 respectively, and relative optical efficiency of luminaire can be enhanced 19.6% in theory compared with traditional optics.

©2011 Optical Society of America

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Figures (11)

Fig. 1
Fig. 1 Schematic diagrams of LED chip array module (a) and flip chip structure (b).
Fig. 2
Fig. 2 Flow diagram of designing primary optical system of LCAP module for road lighting.
Fig. 3
Fig. 3 Schematic of the distribution of LED modules’ light pattern on the major road.
Fig. 4
Fig. 4 Simulation and fitting LIDCs of LCAP module.
Fig. 5
Fig. 5 Schematic of light energy mapping relationship.
Fig. 6
Fig. 6 Distributions of luminance coefficient q ( β , γ ) in the directions of parallel and perpendicular (Observer position: −60m, 1.75m, 1.5m).
Fig. 7
Fig. 7 Sketch diagrams of meshing the target plane.
Fig. 8
Fig. 8 Schematic of point generation method of freeform lens.
Fig. 9
Fig. 9 Primary optical system of LED chip array module.
Fig. 10
Fig. 10 Simulation lighting performance of LIDC (a) and radiation pattern (b) of LCAP module.
Fig. 11
Fig. 11 Simple LED road lamp consists of 9 LCAP modules.

Tables (3)

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Table 1 Parameters of Each Layer in Simulated LED

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Table 2 Comparison of Road Lighting Performance of LED Road Lamp in Simulation and National Standards

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Table 3 Comparison of System Optical Efficiencies Between Traditional LED Road Lamp and New LED Road Lamp Based on LCAP Modules

Equations (4)

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Φ total = 0 2 π d ϕ 0 π / 2 I ( θ ) sin θ d θ = 2 π 0 π / 2 I ( θ ) sin θ d θ ,
Φ total M N = 2 π 2 M θ j θ j + 1 I ( θ ) sin θ d θ   ,         ( j=0, 1, 2, 3 ...   θ 0 = 0 )
L ( β , γ ) = k = 1 K q ( β , γ ) × E k ( c , γ ) = k = 1 K r ( β , γ ) 10 4 × cos 3 γ × E k ( c , γ ) .
[ 1 + n 2 2 n ( O · I ) ] 1 / 2 N = O n I ,
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