Abstract

Important determinants for selecting outdoor lighting are the color-rendering index (CRI) and scotopic-to-photopic (S/P) ratio of the lighting units. The higher the S/P ratio, the better energy savings and visual performance. In this study, CCT-tunable LED lighting units were optimized and fabricated by spectral combination of red, green, blue, and yellow LEDs. The measured results for RGB LEDs provided S/P ratios of 1.55~2.58 and those of RGBY LEDs gave 1.46~2.46 to the correlated color temperatures (CCTs) ranging from 2700 K to 6500 K, with CRI values of over 80 at the same time.

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  1. G. He and J. TangSpectral optimization of color temperature tunable white LEDs with excellent color rendering and luminous efficacyOpt. Lett.20143955705573
  2. P. Zhong, G. He, and M. ZhangOptimal spectra of white light-emitting diodes using quantum dot nanophosphorsOpt. Express20122091229134
  3. G. He and H. YanOptimal spectra of the phosphor-coated white LEDs with excellent color rendering property and high luminous efficacy of radiationOpt. Express20111925192529
  4. Z.-Q. Guo, T.-M. Shih, Y.-J. Lu, Y.-L. Gao, L.-H. Zhu, G.-L. Chen, J.-H. Zhang, S.-Q. Lin, and Z. ChenStudies of scotopic/photopic ratios for color-tunable white light-emitting diodesIEEE Photonics J.201358200409
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  15. J. O. Kim, H. S. Jo, and U. C. RyuA study on variation of S/P ratio and CRI by changing spectral characteristics of RGBY multi-chip LEDsJ. Korean Inst. IIIum. Electr. Install. Eng.2017311019
  16. J. O. Kim, H. S. Jo, and U. C. RyuMesopic luminance improvement and CRI optimization of CCT-tunable multichip LED outdoor lightingProc. KIIEE Annual Autumn Conference & General MeetingIncheon, Korea2018Nov.4
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  18. U. C. Ryu and Y. W. LeeVerifying calibration effectiveness and simulation exactness in comparison between measurement and simulation on optical properties in integrating sphereJ. Korean Inst. IIIum. Electr. Install. Eng.2017313239
  19. S. Fotios and Q. YaoThe association between correlated colour temperature and scotopic/photopic ratioLight Res. Technol.201951803813
  20. S. M. BermanEnergy efficiency consequences of scotopic sensitivityJ. Illum. Eng. Soc.201321314

Other (20)

G. He and J. TangSpectral optimization of color temperature tunable white LEDs with excellent color rendering and luminous efficacyOpt. Lett.20143955705573

P. Zhong, G. He, and M. ZhangOptimal spectra of white light-emitting diodes using quantum dot nanophosphorsOpt. Express20122091229134

G. He and H. YanOptimal spectra of the phosphor-coated white LEDs with excellent color rendering property and high luminous efficacy of radiationOpt. Express20111925192529

Z.-Q. Guo, T.-M. Shih, Y.-J. Lu, Y.-L. Gao, L.-H. Zhu, G.-L. Chen, J.-H. Zhang, S.-Q. Lin, and Z. ChenStudies of scotopic/photopic ratios for color-tunable white light-emitting diodesIEEE Photonics J.201358200409

L. Zan, D. Lin, P. Zhong, and G. HeOptimal spectra of white LED integrated with quantum dots for mesopic visionOpt. Express20162476437653

T. Wu, Y. Lu, Z. Guo, L. Zheng, H. Zhu, Y. Xiao, T.-M. Shih, Y. Lin, and Z. ChenImprovements of mesopic luminance for light-emitting-diode-based outdoor light sources via tuning scotopic/photopic ratiosOpt. Express20172548874897

S. M. Berman, M. Navvab, M. J. Martin, J. Sheedy, and W. TithofA comparison of traditional and high colour temperature lighting on the near acuity of elementary school childrenLight. Res. Technol.2006384149

P. Tregenza and D. LoeThe Design of LightingTaylor & FrancisUK1998

P. R. BoyceHuman Factors in Lighting2nd ed.Taylor & FrancisUK2003

SP ratios and mesopic vision, LIA TS24UK2013[Online]. Available: https://www.thelia.org.uk

Specification of Colours According to the CIE 1931 Standard Colorimetric System and the CIE 1964 Supplementary Standard Colorimetry Standard Colorimetrc System, KS A0061Korea Standard AssociationKorea2015June30

Method of Measuring and Specifying Colour Rendering Properties of Light Sources, CIE Publ. 13.3CIE Central BureauVienna1995

Solid-state Lighting Technology Fact Sheet: Evaluating Color Rendition Using IES TM-30-15, ANSI/IES TM-30-15DOEWashington, DC2015

J. O. Kim, H. S. Jo, and U. C. RyuA study on changes of the S/P ratio and CRI based on the wavelength spectra of RGB 3-chip LED lightingsJ. Korean Inst. IIIum. Electr. Install. Eng.2017311725

J. O. Kim, H. S. Jo, and U. C. RyuA study on variation of S/P ratio and CRI by changing spectral characteristics of RGBY multi-chip LEDsJ. Korean Inst. IIIum. Electr. Install. Eng.2017311019

J. O. Kim, H. S. Jo, and U. C. RyuMesopic luminance improvement and CRI optimization of CCT-tunable multichip LED outdoor lightingProc. KIIEE Annual Autumn Conference & General MeetingIncheon, Korea2018Nov.4

H. S. Jo, J. O. Kim, and U. C. RyuSimulation study on variations of color rendition properties according to combination of 455 nm blue led and phosphor emission spectraJ. Korean Inst. IIIum. Electr. Install. Eng.20193318

U. C. Ryu and Y. W. LeeVerifying calibration effectiveness and simulation exactness in comparison between measurement and simulation on optical properties in integrating sphereJ. Korean Inst. IIIum. Electr. Install. Eng.2017313239

S. Fotios and Q. YaoThe association between correlated colour temperature and scotopic/photopic ratioLight Res. Technol.201951803813

S. M. BermanEnergy efficiency consequences of scotopic sensitivityJ. Illum. Eng. Soc.201321314

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