Abstract

Methods for simulating the color temperature, hue and brightness of daylight illumination for indoor lighting simply by adjusting the intensity of red, green, and blue light emitting diodes are proposed. We obtain uniform color mixing with a light box by adjusting the ratios between the intensities of red, green and blue LEDs. The intensity can be found by measuring the CIE chromaticity coordinates (x, y) and the luminance Y of the daylight with a chroma meter. After the chromaticity coordinates (x, y) and the luminance Y are found, the tristimulus values can be calculated and then transferred to red, green, and blue primaries by linear transformation. With the correct ratio of red, green, and blue intensities, the color temperature, hues and brightness of daylight can be rebuilt by red, green, and blue light emitting diodes.

© 2011 OSA

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Errata

Chih-Hsuan Tsuei and Wen-Shing Sun, "Momentary adjusting methods for simulating the color temperature, hues and brightness of daylight illumination with RGB LEDs for indoor lighting: errata," Opt. Express 19, 18318-18318 (2011)
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-19-19-18318

References

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    [CrossRef]
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    [CrossRef]
  4. J. W. Pan, S. H. Tu, W. S. Sun, C. M. Wang, and J. Y. Chang, “Integration of non-Lambertian LED and reflective optical element as efficient street lamp,” Opt. Express18(S2Suppl 2), A221–A230 (2010).
    [CrossRef] [PubMed]
  5. C. H. Tsuei, J. W. Pen, and W. S. Sun, “Simulating the illuminance and the efficiency of the LED and fluorescent lights used in indoor lighting design,” Opt. Express16(23), 18692–18701 (2008).
    [CrossRef] [PubMed]
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    [CrossRef]
  7. C. H. Tsuei, W. S. Sun, and C. C. Kuo, “Hybrid sunlight/LED illumination and renewable solar energy saving concepts for indoor lighting,” Opt. Express18(S4Suppl 4), A640–A653 (2010).
    [CrossRef] [PubMed]
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  9. B. Fortner and T. E. Meyer, Number By Colors (Springer, 1996).
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    [CrossRef] [PubMed]

Other (10)

J. Chen, K. Huang, P. Lin, and K. Cheng, “A Fiber-and-LED Based Vehicle Headlamp,” in Asia Optical Fiber Communication and Optoelectronic Exposition and Conference, OSA Technical Digest (CD) (Optical Society of America, 2008), paper SaK57. http://www.opticsinfobase.org/abstract.cfm?URI=AOE-2008-SaK57

N. Zheludev, “The life and times of the LED- a 100-year history,” Nat. Photonics1(4), 189–192 (2007).
[CrossRef]

T. Taguchi, “Developing White LED Lighting Systems and its Technological Roadmap in Japan,” J. Light Vis. Env.30(3), 177–182 (2006).
[CrossRef]

J. W. Pan, S. H. Tu, W. S. Sun, C. M. Wang, and J. Y. Chang, “Integration of non-Lambertian LED and reflective optical element as efficient street lamp,” Opt. Express18(S2Suppl 2), A221–A230 (2010).
[CrossRef] [PubMed]

C. H. Tsuei, J. W. Pen, and W. S. Sun, “Simulating the illuminance and the efficiency of the LED and fluorescent lights used in indoor lighting design,” Opt. Express16(23), 18692–18701 (2008).
[CrossRef] [PubMed]

K. Matsushima, T. Nishimura, S. Ichikawa, M. Sekiguchi, T. Tanaka, A. Hakata, and F. Tazuke, “Indoor Lighting Facilities,” J. Light Vis. Env.34(3), 195–210 (2010).
[CrossRef]

C. H. Tsuei, W. S. Sun, and C. C. Kuo, “Hybrid sunlight/LED illumination and renewable solar energy saving concepts for indoor lighting,” Opt. Express18(S4Suppl 4), A640–A653 (2010).
[CrossRef] [PubMed]

R. W. G. Hunt, Measuring Colour (Fountain Press, 1998).

B. Fortner and T. E. Meyer, Number By Colors (Springer, 1996).

I. Powell, “Quartz-halogen D65 simulation,” Appl. Opt.34(34), 7925–7934 (1995).
[CrossRef] [PubMed]

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Figures (5)

Fig. 1
Fig. 1

Layout of the light box above the indoor space.

Fig. 2
Fig. 2

CIE1931 chromaticity diagram.

Fig. 3
Fig. 3

Simulated daylight illumination for indoor lighting in early morning.

Fig. 4
Fig. 4

Simulated daylight illumination for indoor lighting at 10 a.m.

Fig. 5
Fig. 5

Simulated daylight illumination for indoor lighting at noon.

Equations (9)

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

X = ( x y ) Y
Z = ( z y ) Y ,
[ X Y Z ] = [ 2.7689 1.7517 1.1302 1.0000 4.5907 0.0601 0.00000 0.0565 5.5943 ] [ R G B ] ,
= [ 0.041844 0.15866 0.08283 0.09117 0.25242 0.01570 0.00092 0.00255 0.17858 ] [ X Y Z ] .
x 3 = Y 1 Y 1 + Y 2 x 1 + Y 2 Y 1 + Y 2 x 2
y 3 = Y 1 Y 1 + Y 2 y 1 + Y 2 Y 1 + Y 2 y 2 ,
x 2 = ( Y 1 + Y 2 ) x 3 Y 1 x 1 Y 2 ,
y 2 = ( Y 1 + Y 2 ) y 3 Y 1 y 1 Y 2 ,
Y 2 = Y 3 Y 1 .

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