Equivalent Brightness Fitting Calculation Method about White LEDs

Abstract:

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White LEDs can show different correlated color temperature (abbreviated as CCT) by adjusting the luminous spectrum peak distribution and relative strength. Recent research results indicate that spectral luminous efficiency function of mesopic vision Vmes(λ) and equivalent brightness are associated with luminous spectra of light sources. A series of white LEDs with different CCT are tested and calculated, it shows white LED with higher CCT has higher mesopic vision equivalent brightness, although the brightness are identical when the tester corrected by traditional photopic vision spectral luminous efficiency V(λ). From the equivalent brightness curve fitting, the curve can be described as a polynomial function, for it excellent correlation, the more value of equivalent brightness could be calculated without complex derivation.

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Periodical:

Edited by:

Dongye Sun, Wen-Pei Sung and Ran Chen

Pages:

2721-2725

DOI:

10.4028/www.scientific.net/AMM.121-126.2721

Citation:

Y. Yang et al., "Equivalent Brightness Fitting Calculation Method about White LEDs", Applied Mechanics and Materials, Vols. 121-126, pp. 2721-2725, 2012

Online since:

October 2011

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$38.00

[1] Palmer D. A. A system of mesopic photometry, Nature, 1966, 209: 276-281.

[2] Ikeda M S H, Mesopic luminous efficiency functions, Journal of the Optical Society of America, 1981, 71: 280-284.

[3] Sagawa K, Takeichi K. Spectral luminous efficiency functions in the mesopic range, Journal of the Optical Society of America A: Optics and Image Science, 1986, 3(1): 71-75.

DOI: 10.1364/josaa.3.000071

[4] A. Freiding, M. Eloholma, J. Ketomaki, etc, Mesopic visual efficiency Ⅰ: detection threshold measurements, Lighting Research and Technology, 2007, 39(4): 319-334.

DOI: 10.1177/1477153507080917

[5] G. Varady, A. Freiding, M. Eloholma, etc, Mesopic visual efficiency Ⅱ: detection threshold measurements, Lighting Research and Technology, 2007, 39(4): 335-364.

DOI: 10.1177/1477153507080922

[6] CIE Publication 191, (2010) Recommended System for Mesopic Photometry Based on Visual Performance, Vienna.

[7] JJG 211-2005, Luminance Meter. (in Chinese).

[8] Hu yingkui, Chen zhonglin, Liu yingying, Luminous efficiencies of common light sources of road lighting in mesopic lighting level, [J. ], Journal of Chongqing University (Natural Science Edition), 2007, 30(1):139~146. (in Chinese).

[9] CIE Publication 81, (1989) Mesopic Photometry: History, special problems and practical solutions.

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