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Melanopic Limits of Metamer Spectral Optimisation in Multi-Channel Smart Lighting Systems

Author

Listed:
  • Babak Zandi

    (Laboratory of Lighting Technology, Department of Electrical Engineering and Information Technology, Technical University of Darmstadt, D-64289 Darmstadt, Germany)

  • Adrian Eissfeldt

    (Laboratory of Lighting Technology, Department of Electrical Engineering and Information Technology, Technical University of Darmstadt, D-64289 Darmstadt, Germany)

  • Alexander Herzog

    (Laboratory of Lighting Technology, Department of Electrical Engineering and Information Technology, Technical University of Darmstadt, D-64289 Darmstadt, Germany)

  • Tran Quoc Khanh

    (Laboratory of Lighting Technology, Department of Electrical Engineering and Information Technology, Technical University of Darmstadt, D-64289 Darmstadt, Germany)

Abstract

Modern indoor lighting faces the challenge of finding an appropriate balance between energy consumption, legal requirements, visual performance, and the circadian effectiveness of a spectrum. Multi-channel LED luminaires have the option of keeping image-forming metrics steady while varying the melanopic radiance through metamer spectra for non-visual purposes. Here, we propose the theoretical concept of an automated smart lighting system that is designed to satisfy the user’s visual preference through neural networks while triggering the non-visual pathway via metamers. To quantify the melanopic limits of metamers at a steady chromaticity point, we have used 561 chromaticity coordinates along the Planckian locus (2700 K to 7443 K, ± Duv 0 to 0.048) as optimisation targets and generated the spectra by using a 6-channel, 8-channel, and 11-channel LED combination at three different luminance levels. We have found that in a best-case scenario, the melanopic radiance can be varied up to 65% while keeping the chromaticity coordinates constant ( Δ u ′ v ′ ≤ 7.05 × 10 − 5 ) by using metamer spectra. The highest melanopic metamer contrast can be reached near the Planckian locus between 3292 and 4717 K within a Duv range of −0.009 to 0.006. Additionally, we publish over 1.2 million optimised spectra generated by multichannel LED luminaires as an open-source dataset along with this work.

Suggested Citation

  • Babak Zandi & Adrian Eissfeldt & Alexander Herzog & Tran Quoc Khanh, 2021. "Melanopic Limits of Metamer Spectral Optimisation in Multi-Channel Smart Lighting Systems," Energies, MDPI, vol. 14(3), pages 1-16, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:3:p:527-:d:483886
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    References listed on IDEAS

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