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Keywords = multichannel luminaire

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17 pages, 25897 KB  
Article
Advanced Multichannel Lighting Control Systems in Heritage Environments: Case Study of the Cathedral of Seville
by Honorio Aguilar, Ignacio Acosta, Sara Mohamed and Jaime Navarro
Appl. Sci. 2024, 14(18), 8242; https://doi.org/10.3390/app14188242 - 12 Sep 2024
Viewed by 1724
Abstract
The appropriate preservation and color rendering of paintings and art pieces are a pending subject in architectural heritage, since, in most of the cases, lighting systems are not really focused on the conservation and suitable perception of these heritage resources, due to the [...] Read more.
The appropriate preservation and color rendering of paintings and art pieces are a pending subject in architectural heritage, since, in most of the cases, lighting systems are not really focused on the conservation and suitable perception of these heritage resources, due to the limitations of standard LED lamps and lighting configurations. In this context, a multichannel luminaire system is proposed in the case study of the Cathedral of Seville, providing a variable and rich spectral distribution, which allows an excellent color perception linked to the daylight conditions, while the short-wavelength light is minimized in order to reduce photodegradation. Two scenarios are addressed: Museum of the Cathedral and Evangelist Chapel. The multichannel luminaire system is tested by means of subjective surveys and objective procedures (Farnswoth-Munsell and Natural Color System tests). The results show that the proposed spectral distribution of the multichannel system provides a better color discrimination in comparison with typical lighting systems, as well as a better preservation, defining a suitable lighting technology for architectural heritage. The novelty of this study lies in the multi-parameter approach, taking care of color rendering while photodegradation is minimized. Full article
(This article belongs to the Special Issue Control Systems for Next Generation Electric Applications)
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17 pages, 3344 KB  
Article
Multi-Channel LED Luminaires: An Object-Oriented Approach for Retail Lighting Based on the SOR Framework
by Kaveh Ahmadian Tazehmahaleh, Hamideh Godazgar, Kevin AG Smet and Peter Hanselaer
Sustainability 2022, 14(10), 5994; https://doi.org/10.3390/su14105994 - 15 May 2022
Cited by 5 | Viewed by 3177
Abstract
In this paper, a method to find the optimum spectrum for the illumination of objects in a retail environment is presented. A variety of familiar objects are illuminated with a number of illuminants of a predefined Correlated Color Temperature (CCT) of 3000 K, [...] Read more.
In this paper, a method to find the optimum spectrum for the illumination of objects in a retail environment is presented. A variety of familiar objects are illuminated with a number of illuminants of a predefined Correlated Color Temperature (CCT) of 3000 K, strategically selected from the entire range of metamers, which can be generated by the multi-channel luminaire under test. The solution space has been derived by solving basic colorimetric equations using a brute force method. In a paired comparison experiment, observers had to select the most “attractive” appearance for the presented objects. The results illustrate that objects may indeed appear more attractive for a statistically meaningful number of observers under a particular lighting condition. Assuming attractiveness of an object as a stimulus in the SOR framework, this approach facilitates the generation and the selection of the “optimum” spectrum based on the goals of the stakeholders in retail lighting applications. Full article
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16 pages, 4453 KB  
Article
Melanopic Limits of Metamer Spectral Optimisation in Multi-Channel Smart Lighting Systems
by Babak Zandi, Adrian Eissfeldt, Alexander Herzog and Tran Quoc Khanh
Energies 2021, 14(3), 527; https://doi.org/10.3390/en14030527 - 20 Jan 2021
Cited by 14 | Viewed by 7414
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 [...] Read more.
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 (Δuv7.05×105) 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. Full article
(This article belongs to the Special Issue Smart City Lighting Systems)
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