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

Babak Zandi, Adrian Eissfeldt, Alexander Herzog and Tran Quoc Khanh
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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

Energies, 2021, vol. 14, issue 3, 1-16

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.

Keywords: smart lighting; multi-channel LED optimisation; circadian photoentrainment; non-image-forming vision; metamer spectra (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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