Quantitative Analysis of Relationship Between Subjective and Objective Evaluation Indexes of LED Light Environment in Confined Space

Abstract

Based on the definition of light and the characteristics of indoor environment and its function settings, this paper determines the subjective evaluation index of LED light environment affecting confined space as pleasant, spacious, privacy, glare uncomfortable, clear, relaxed, spatial lighting coordination, color authenticity, three-dimensional shape, light and dark contrast. According to the actual closed space, the objective index is selected as the illumination level. Quantitative analysis of subjective evaluation indicators and objective indicator data, the relationship between subjective evaluation indicators and objective indicators were obtained by nonlinear regression analysis. The result showed that the six subjective evaluation indexes of pleasant, spacious, clear, spatial lighting coordination, three-dimensional shape and color authenticity all increase and then decrease with the increase of illumination; that the four subjective evaluation indexes of privacy, relaxed, glare uncomfortable, light and dark contrast all decreased with the increase of illumination. The relationship between the subjective comprehensive evaluation index and the objective index determined in the paper can provide a simple and practical method for the evaluation of LED light environment quality in confined space.