Relationship of Different Scales for Evaluating the Quality of LED Lighting

Existing studies used different scales to evaluate the quality of LED lighting by psychophysics experiments, which viewed specific objects. It is believed that for universal lighting, diverse objects are needed to evaluate color quality. In order to produce a suitable factors space to evaluate the quality of universal lighting, a psychophysics experiment was conducted, which used objects of different color or attribute. The experiments were carried out in darkrooms. In total, 44 observers viewed seven groups of objects to evaluate lighting quality. In this paper, factor analysis was used to reduce the large number of scales into fewer underlying independent factors. The results showed that objects of different color or attribute had an impact on visual perception, and three factors dominate visual perceptions: Attraction, Vividness and Warmth. Basing on this finding, a three-factor space was defined. The work was intended to set up a three-factor space as the help for the construction of LED lighting evaluation and application methods.