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Luminous efficacy of white LED in the mesopic vision state

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Abstract

The traditional eye sensitivity function based on photopic vision is not applicable in the mesopic vision state. The mesopic vision is studied by using the photopic and scotopic vision state sensitivity functions. And the model which links the mesopic sensitivity with the photopic and scotopic states is built. Based on the model, the luminous efficacy of mesopic vision is calculated and applied to the spectrum distribution of LED light sources. The results show that the luminous efficacy of a commercial YAG phosphor converted white LED is up to 172.7 lm/W at mesopic vision, which is 67.2% higher than that of photopic vision state. We also conclude that the optimal spectral power distribution of the LED will greatly increase the mesopic luminous efficacy.

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Authors and Affiliations

  1. Key Laboratory of Integrated Microsystems, Shenzhen Graduate School of Peking University, Shenzhen, 518055, China

    Peng Jin  (金鹏), Yi-feng Wang  (王一峰), Qi-feng Zhou  (周奇峰) & Chun-yu Yu  (喻春雨)

  2. Lemnis lighting Inc.’s-Hertogenbosch, Amsterdam, Netherlands

    John Rooymans

Authors
  1. Peng Jin  (金鹏)
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  2. Yi-feng Wang  (王一峰)
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  3. Qi-feng Zhou  (周奇峰)
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  4. John Rooymans
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  5. Chun-yu Yu  (喻春雨)
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Corresponding author

Correspondence to Peng Jin  (金鹏).

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Jin, P., Wang, Yf., Zhou, Qf. et al. Luminous efficacy of white LED in the mesopic vision state. Optoelectron. Lett. 5, 265–267 (2009). https://doi.org/10.1007/s11801-009-9026-6

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  • DOI: https://doi.org/10.1007/s11801-009-9026-6

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