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Side-illuminating LED luminaires with accurate projection in high uniformity and high optical utilization factor for large-area field illumination

Yi-Chien Lo, Jhih-You Cai, Ming-Shiou Tasi, Zheng-Yu Tasi, and Ching-Cherng Sun

Open Access Open Access

Abstract

A novel light luminaire is proposed and experimentally analyzed, which accurately projects light into a large rectangular area to achieve uniform illumination and a high optical utilization factor at the target. Side-illuminating luminaires for large-scale illuminated area are typically set with an elevated tilt angle to enlarge the illuminated area. However, the light pattern is bent thereby reducing the uniformity and optical utilization factor at the target. In this paper, we propose an efficient and useful approach with a rotationally symmetric projection lens that is trimmed to adjust the bending effect and to form a rectangular illumination light pattern on the ground. The design concept is demonstrated and verified. Several potential applications such as highly uniform illumination with fitting shapes for sport courts are analyzed and discussed.

© 2014 Optical Society of America

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Figures (19)
Fig. 1
Fig. 1 (a) direct-illuminating type, (b) bent pattern from side-illuminating type, and (c) adjusted pattern from specific design.

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Fig. 2
Fig. 2 The apparatus of the illuminated.

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Fig. 3
Fig. 3 CREE XM-L LED: (a) the optical model and (b) a real sample.

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Fig. 4
Fig. 4 Angular pattern at different distances in the mid-field region: (a) 1.5cm, (b) 3cm, (c) 5cm, and (d) 7cm.

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Fig. 5
Fig. 5 The luminaire contains a lens array and a flat reflector.

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Fig. 6
Fig. 6 (a) The uniform pattern from the symmetric freeform lens, (b) the pattern from the lens with the diamond-shaped cutting, (c) the tilted lens array module without a planar mirror and the corresponding light pattern, and (d) the tilted lens array module with a planar mirror on one side and the corresponding light pattern.

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Fig. 7
Fig. 7 (a) The trapezoid pattern formed by the flat reflector, (b) the new coordinate axis ( x ' , y ' , z ' ) for the trapezoid pattern, (c) the projective part at x ' - z ' plane, and (d) the projective part at y ' - z ' plane.

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Fig. 8
Fig. 8 (a) The array with several luminaires arranged side by side, (b) the pattern with lower loss effect, and (c) the final pattern to meet the target with two luminaires in the opposite side.

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Fig. 9
Fig. 9 (a) The prototype by CNC machining, (b) the simulated pattern, and (c) the experimental result.

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Fig. 10
Fig. 10 (a) The sampling points at the vertical axis, (b) the sampling points at horizontal axis.

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Fig. 11
Fig. 11 The illuminance distribution along (a) the V1 line, (b) the V2 line, (c) the V3 line, (d) the V4 line, and (e) the V5 line.

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Fig. 12
Fig. 12 The illuminance distribution along (a) the V1 line, (b) the V2 line, (c) the V3 line, (d) the V4 line, and (e) theV5 line.

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Fig. 13
Fig. 13 The dimensions of the badminton court.

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Fig. 14
Fig. 14 The analysis for average illuminance and optical uniformity for (a) section A and (b) section B.

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Fig. 15
Fig. 15 The simulated scene: (a) top view and (b) 3D view.

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Fig. 16
Fig. 16 The dimensions of the volleyball court.

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Fig. 17
Fig. 17 The analysis of average illuminance and optical uniformity for section A.

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Fig. 18
Fig. 18 The simulated scene of the illumination on the volleyball court: (a) top view and (b) 3D view.

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Fig. 19
Fig. 19 The simulated cinestrip: (a) top view and (b) 3D view.

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Equations (8)

Equations on this page are rendered with MathJax. Learn more.

[ x ′ y ′ z ′ ] = [ 1 0 0 0 cos θ sin θ 0 − sin θ cos θ ] [ x y z − H ] + [ 0 0 H ] .
R ′ 1 = [ x ′ r 1 y ′ r 1 z ′ r 1 ] = [ L / 2 d cos θ − H sin θ − d sin θ − H cos θ + H ] ,
R ′ 2 = [ x ′ r 2 y ′ r 2 z ′ r 2 ] = [ L / 2 ( W + d ) cos θ − H sin θ − ( W + d ) sin θ − H cos θ + H ] .
x d 1 = H H + | z ′ r 1 | ( L / 2 ) .
x d 2 = H H + | z ′ r 2 | ( L / 2 ) .
y d 2 = H H + | z ′ r 2 | W cos θ .
θ 1 = cos − 1 [ − x d 1 x d 2 + x d 2 2 x d 2 ( x d 1 − x d 2 ) 2 + y d 2 2 ]
θ 2 = 2 cos − 1 [ x d 1 2 − x d 1 x d 2 x d 1 ( x d 1 − x d 2 ) 2 + y d 2 2 ] .
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