“…Therefore, under varying CCT of ambient lights, studies on the preferred CCT for given images and display types are necessary. For the perceptual studies [2,3,7,10], ambient lighting modules and a TV are installed in an appropriate room and an experiment is conducted while a subject and an experimenter at least are being at the same space for a while. However, under ongoing attack and wide spread of Corona Virus Infectious Disease 2019 (COVID-19), non-contact experimental environment (subjectexperimenter-separated) or equivalent to the social requirements are strongly required in every daily life, industry and also academia.…”