Abstract

LED flat panel light is an innovative lighting product in recent years. However, current flat panel light products still contain some drawbacks, such as narrow lighting areas and hot spots. In this study, a micro-secondary lens array technique was proposed and applied for the design of the light guide surface to improve the illumination uniformity. By using the micro-secondary lens array, the candela distribution of the LED flat panel light can be adjusted to similar to batwing distribution to improve the illumination uniformity. The experimental results show that the enhancement of the floor illumination uniformity is about 61%, and that of the wall illumination uniformity is about 20.5%.

© 2012 OSA

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References

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2010 (1)

2009 (1)

2008 (1)

1994 (2)

Cen, S.

Davies, P. A.

Jin, S.

Kuo, M. F.

Pen, J. W.

Rabl, A.

Ries, H.

Sun, L.

Sun, W. S.

Teng, T. C.

Tsuei, C. H.

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Figures (17)

Fig. 1
Fig. 1

Enlarged picture of the micro- secondary lens array on the light guide surface.

Fig. 2
Fig. 2

Illustration of the optical model for single micro-lens.

Fig. 3
Fig. 3

LED flat panel light pillar lens.

Fig. 4
Fig. 4

Side view picture for the ray traces of the proposed flat panel light.

Fig. 5
Fig. 5

Top view picture for the ray traces of the proposed pillar lens of flat panel light.

Fig. 6
Fig. 6

Illustration of free form lens for LED flat panel light.

Fig. 7
Fig. 7

Side view picture of the proposed free form lens for ray tracing.

Fig. 8
Fig. 8

Top view picture of the proposed free form lens for ray tracing.

Fig. 9
Fig. 9

Candela distribution of commercial flat panel lights.

Fig. 10
Fig. 10

Pseudo-color performance of general flat panel lights in a computer classroom space.

Fig. 11
Fig. 11

Grayscale performance of general flat panel lights in a computer classroom space.

Fig. 12
Fig. 12

Candela distribution of the pillar lens.

Fig. 13
Fig. 13

Pseudo-color performance of the pillar lens’ flat panel lights in a computer classroom space.

Fig. 14
Fig. 14

Grayscale performance of the pillar lens’ flat panel lights in a computer classroom space.

Fig. 15
Fig. 15

Candela distribution of the free form lens design.

Fig. 16
Fig. 16

Pseudo-color performance of the free-form flat panel lights in a computer classroom space.

Fig. 17
Fig. 17

Grayscale performance of the free-form flat panel lights in a computer classroom space.

Tables (2)

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Table 1 Computer classroom space dimension

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Table 2 Performance comparison between the proposed and the commercial flat panel light products

Equations (2)

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A E f ds = i=1 N C i E i ds = E total ,
U= E min. / E ave. ,

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