# A Study on the Impact of Blue Light and Its Brightness on Long-Term Memory
## 4 Conclusions  
In this study, the effect of blue light and its brightness on long-term memory retention was experimentally evaluated. The results confirm that blue light is more effective than red light in long-term memory enhancement and that this effect is more pronounced when the light is brighter. No interaction effect between light color and brightness was found, but the difference in the effect of two types of light with different colors on long-term memory retention tended to become gradually narrower as their brightness increased.  
The major findings of this study have significant potential for individuals who suffer from learning or memory difficulties.  
The results of this study can serve as basic data in creating educational environments to improve students' learning performance or ensuring optimal lighting environments tailored to senior centers or nursing homes where elderly individuals reside. While working memory plays an important role in environments where effective cognitive functioning is required, long-term memory is critical in enabling people to retain memory for a long time. Therefore, exploring the effect of light on long-term memory can provide an important means to retain learned information for a longer period while delaying the forgetting of data.  
Notably, it is worth noting light itself has an unlimited potential for various critical tasks in modern society, such as learning or memory enhancement. In this context, some challenging findings introduced in this study deserve further consideration and clarification as we further explore the effect of light on humanity.  
Conceptualization, C.-W.L. and J.-M.S.; methodology, J.-H.K.; software, K.-S.L.; validation, C.-W.L., J.-H.K. and J.-M.S.; formal analysis, C.-W.L.; investigation, C.-W.L.; resources, J.-H.K.; data curation, C.-W.L.; writing--original draft preparation, C.-W.L.; writing--review and editing, C.-W.L.; visualization, C.-W.L.; supervision, J.-H.K.; project administration, J.-H.K.; funding acquisition, J.-H.K., C.-W.L. and K.-S.L. All authors have read and agreed to the published version of the manuscript.  
This work was supported by the research grant of the Kongju National University in 2021; this research was supported by National Research Foundation of Korea (No.2021R1A6A3A01086771); this research was supported by Korea Basic Science Institute (National research Facilities and Equipment Center) grant funded by the Ministry of Education (2022R1A6C101A741); and this research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2019R1A6A1A03032988).  
The study was conducted in accordance with the Declaration of Helsinki, and approved by the Institutional Review Board (or Ethics Committee) of Kongju national university (protocol code 2018-35 and 2018.08.02).  
Informed Consent Statement: Informed consent was obtained from all subjects involved in the study.  
The raw data supporting the conclusions of this article will be made available by the authors on request.  
The authors declare no conflict of interest.