Investigation on Circadian Action and Color Quality in Laser-Based Illuminant for General Lighting and Display

Lei, Shuo-Di; Liu, Bijing; Gao, Yang; Dong, Xiaopeng; Gong, Yu-Jia; Xu, Jian; Xu, Yun-Xin; Wang, Dong; Guo, Ziquan; Wu, Tingzhu; Zhou, Chenliang; Cai, Zong-Jian; Lu, Yijun; Zhong, Cheng

doi:10.1109/jphot.2020.3007529

Cited by 11 publications

(2 citation statements)

References 26 publications

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“…Compared to previous spectral optimisation studies [6,58,[60][61][62][63]100,101,[115][116][117][118], this work provides at the authors' best knowledge one of the most comprehensive multichannel LED datasets for metamer spectra. More advanced analyses between additional colour quality metrics are possible with the optimised spectra, which we did not fully exploit.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2021

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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 (Δu′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.

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Section: Discussionmentioning

confidence: 99%

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

et al. 2021

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“…To improve the CRI of pc-LBI, the spectral power distribution of emission spectrum from pc-LBI and red LDs is considered. We assumed that the peak wavelength and FWHM of blue LDs and red LDs are constant [37,38]. So, the spectral power distribution of emissive pc-LBI will be linearly combined with the spectral power distribution of red emissive parts.…”

Section: Calculation Model 1) Methods To Improve Crimentioning

confidence: 99%

Phosphor-Converted Laser-Based Illuminant With High Color Rendering Index and Low Blue Light Hazard

Peng

Yang

et al. 2022

IEEE Photonics J.

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Laser-based illuminant has been a topic of increasing interest in recent years and both of color quality and blue light hazards are the key issues that need to be addressed. In this paper, the performances of color quality and blue light hazard were investigated by comparing 465 nm laser-excited phosphor materials and traditional 452 nm laser-excited phosphor materials respectively. Phosphor-converted laser-based illuminant (pc-LBI) consisting of 465-nm and 635-nm LDs (LBI-465) has a color rendering index (CRI) of 88.7, which was 8.2% higher than that of pc-LBI consisting of 452-nm and 635-nm LDs (LBI-452). The correlated color temperature (CCT) of white light of both pc-LBIs ranges from 2200 K to 5000 K with the adjustment of red lasers. The blue light hazard efficiency of radiation (BLHER) of LBI-465 is below 0.15, which is 19% lower than that of LBI-452. The results showed that high color quality and low blue light hazard were simultaneously achieved by LBI-465. In addition, the above experimental results are in good agreement with the simulated results. Based on these above results, pc-LBI is believed to render laser-based white light sources with good color performance and boost the growth of solid-state lighting.

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One phosphor converted human centric LED lamp

Nafdey,

Moharil

2024

Appl. Phys. A

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Investigation on Circadian Action and Color Quality in Laser-Based Illuminant for General Lighting and Display

Cited by 11 publications

References 26 publications

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

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

Phosphor-Converted Laser-Based Illuminant With High Color Rendering Index and Low Blue Light Hazard

One phosphor converted human centric LED lamp

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