Multi-Channel LED Luminaires: An Object-Oriented Approach for Retail Lighting Based on the SOR Framework
Round 1
Reviewer 1 Report
This manuscript proposed a method to find the optimum spectrum for the illumination of objects in a retail environment using the Stimulus-Organism-Response (SOR) model. Good efforts have been done in this manuscript; however, the paper needs more details to position its gap (novelty) in the literature context regarding the state of the art. Also, the references are not updated also not enough to cover the previous studies on this scope. Overall, the method and all experiment steps, also the results are very clear. Another comment: please include the Illumination spectra for each object (appendix) in the main text of the manuscript.
Author Response
Comment 1:
This manuscript proposed a method to find the optimum spectrum for the illumination of objects in a retail environment using the Stimulus-Organism-Response (SOR) model. Good efforts have been done in this manuscript; Overall, the method and all experiment steps, also the results are very clear.
Response:
We appreciate your feedback.
Comment 2:
However, the paper needs more details to position its gap (novelty) in the literature context regarding the state of the art. Also, the references are not updated also not enough to cover the previous studies on this scope.
Action:
We investigated a broader range of journals and some recent papers and patents are cited and below paragraph is added to the literature review part.
"According to Royer et al[11] using local chroma shift values helps specific object based illumination and new guidelines and recommendations needs to be generated.
In recent years, a number of methods with respect to the software and hardware of multichannel light sources have been proposed and registered as patents. They are focusing on how to emphasize the object color[12], to increase the object chroma when the light source is dimmed [13] or to adjust the spectrum based on the user’s preference [14]. Although these publications are an indication of the future perspective for an object-oriented approach in lighting, however, none of them do report on a strategy to facilitate the end user in selecting the optimal spectrum."
Papers
P. Royer, K. W. Houser, and A. David, “Chroma Shift and Gamut Shape: Going Beyond Average Color Fidelity and Gamut Area,” LEUKOS, vol. 14, no. 3, pp. 149–165, Jul. 2018, doi: 10.1080/15502724.2017.1372203.
Patents
Garufo and M. Lomberg, “Objektbeleuchtung,” DE102018130596A1, Jun. 04, 2020
Houser, “Light sources that increase object chroma when dimmed,” US20210345461A1, Nov. 04, 2021
Kevin James VICK, Gary Robert Allen, William Winder Beers, and Olivia Rae VICK, “Enhanced color-preference light sources,” EP3044504B1, Jul. 20, 2016
Table 1 is updated and below references of more recent studies are added.
Sina and J. Wu, “The effects of retail environmental design elements in virtual reality (VR) fashion stores,” The International Review of Retail, Distribution and Consumer Research, pp. 1–22, Mar. 2022, doi: 10.1080/09593969.2022.2049852.
Wang, “The enhancement of appetite through the use of colored light in case of a cake: Preliminary evidence from event‐related potentials,” Color Research & Application, vol. 46, no. 2, pp. 456–466, Apr. 2021, doi: 10.1002/col.22592.
Y. Kang, N. Youn, and H. C. Yoon, “The self-regulatory power of environmental lighting: The effect of illuminance and correlated color temperature,” Journal of Environmental Psychology, vol. 62, pp. 30–41, Apr. 2019, doi: 10.1016/j.jenvp.2019.02.006.
Comment 3:
Another comment: please include the Illumination spectra for each object (appendix) in the main text of the manuscript.
Response:
Accepted.
Action:
Illumination spectra has been moved to the main text. A digital attachment is also added as requested by other reviewers.
Reviewer 2 Report
It seems to be that this article is the next to one of their already published articles in this and other journals with a similar topic. It means that the research in this area is still growing up by the author's team. From the article plagiarism point of view, this article seems to be prepared carefully and well. The value of similarity (24%) with other publications is low (please see attachment).
Generally, the article is well prepared and subsequently provides all necessary information about the solved task to a reader. On the other hand, the quality of the figures is low!!! Therefore, I would recommend changing all of them. I would use figures with better readability and higher resolution. Literature references are sufficient and from quality sources. The English language is at a sufficient level.
Fig 2 should be in colour!
Please add a reference to Tab1.
Your used devices were calibrated? Please provide more details about this matter.
In Fig. 6 you should visualize the dimensions of the tested/experimental room.
Comments for author File: 
Comments.pdf
Author Response
Comment 1:
It seems to be that this article is the next to one of their already published articles in this and other journals with a similar topic. It means that the research in this area is still growing up by the author's team. From the article plagiarism point of view, this article seems to be prepared carefully and well. The value of similarity (24%) with other publications is low (please see attachment).
Generally, the article is well prepared and subsequently provides all necessary information about the solved task to a reader. On the other hand, the quality of the figures is low!!! Therefore, I would recommend changing all of them. I would use figures with better readability and higher resolution. Literature references are sufficient and from quality sources. The English language is at a sufficient level.
Response:
We appreciate your feedback.
Action:
We improved all the figures
Comment 2:
Fig 2 should be in colour!
Response:
Accepted
Action:
We have added colour to Fig. 2.
Comment 3:
Please add a reference to Tab1.
Response:
References were already mentioned in the second column inside the content of the table, in front of each line. In total 21 references were cited inside that table.
Comment 4:
Your used devices were calibrated?Please provide more details about this matter.
Response:
Yes, we had applied a calibrates irradiance meter which was reported as “The spectrum was measured using a Gigahertz Optik BTS-45 calibrated spectral irradiance meter at a distance of 1.00 m below the light source” in line 200.
Do we need to specify more details?
Comment 5:
In Fig. 6 you should visualize the dimensions of the tested/experimental room.
Response:
Accepted
Action:
We have replaced the figure with a new one where dimensions are reported.
Reviewer 3 Report
- please check the wording in line 320: "if it is higher ........"
- there is a typo in table 4, line 306
- At the end of page 15/21 and at the beginning of page 16/21, the sentences between lines no. 401 and 406 should be reconsidered: From your experiments you could find an optimal spectrum for each metamer that has higher saturation, but Rschj must not be the highest value. From the reviewer's point of view, the saturation has to be increased moderately and above a certain value the impression of the scene is reduced. This moderate value should be found depending on the object color and CCT. 4. Please extend your Table 7 with values of CQS Qp (adapted from W. Davis, Y.Ohno 2010) and analyze the predictability of this metric.
- Please enter all spectra of the illuminations in the table in an Excel spreadsheet and add them to your paper as an additional dataset as a digital attachment.
Thank you for your research.
Author Response
Comment 1:
please check the wording in line 320: "if it is higher ........"
Response:
We do apologize for this mistake.
Action:
The word “it” has been replaced by “Pij” and the new sentence is:
“if the Pij is higher than the maximum of the two critical values (CVmax) then the stimulus is the more preferred one”
Comment 2:
there is a typo in table 4, line 306
Response:
I am sorry but we could not find any typo in the mentioned line and table.
Could you please clarify which typo is meant?
Comment 3:
At the end of page 15/21 and at the beginning of page 16/21, the sentences between lines no. 401 and 406 should be reconsidered: From your experiments you could find an optimal spectrum for each metamer that has higher saturation, but Rschj must not be the highest value. From the reviewer's point of view, the saturation has to be increased moderately and above a certain value the impression of the scene is reduced. This moderate value should be found depending on the object color and CCT.
Response:
We agree with this point and we appreciate your feedback. The formerly mentioned results were only within the selected spectra of this research. Further studies are required to find the optimum saturation or chroma enhancement.
Action:
The paragraph has been rewritten in this way
given a particular multi-channel lamp and a particular object, one can calculate all metamers according to the guidelines from this paper; for each metamer the Rschj or Rmi if available) value corresponding to the hue bin of the object under test is calculated. According to our experiment, the metamer with the highest Rschj is considered to be the most attractive one. However, when considering other CCTs and different sets of objects, a moderate chroma shift might be more preferred[10]. Further experiments are required to find the optimum level of local chroma shift for a broad range of illumination conditions.
Comment 4:
Please extend your Table 7 with values of CQS Qp (adapted from W. Davis, Y.Ohno 2010) and analyze the predictability of this metric.
Response:
Agree .
Action:
Table 7 is updated and CQS Qp is added.
Below lines has been added to the discussion
“The predictive power of Qp for visual attractiveness is also not quite well. For Green Salad, Brocolli, Milka and Green Apple, the spectrum having a lower Qp was the most visually attractive one.”
Comment 5:
Please enter all spectra of the illuminations in the table in an Excel spreadsheet and add them to your paper as an additional dataset as a digital attachment.
Response:
Accepted
Action:
An Excel file including all spectra data are added as digital attachment
