The Reflective Coefficient and Physical Characteristics on Light Intensity in Lecture Classrooms at a University, Bangkok
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Abstract
The intensity of light in the classroom affects learning. There are few studies of lighting in classrooms in urban university buildings with tall buildings, including physical factors that may affect lighting. The objective of this exploratory study was to investigate the reflectance coefficient and the physical characteristics that affect light intensity in three lecture-style classrooms: small, medium, and large, comprising a total of 42 classrooms at a university. The tools used are a lux meter and an observation form. The statistics used in the analysis include number, percentage, mean, standard deviation, One-way ANOVA, and Pearson's correlation. The results of the study found that the most small and large classrooms met the standards. On the other hand, in medium-sized classrooms, 62.0 % did not pass the standards. The large classrooms have the highest average light intensity, equal to 652.09 (S.D. = 31.61). When comparing the average lighting intensity of the three classroom sizes, it was found that there were statistically significant differences (p<0.05). For floor and wall reflection coefficients, it was found that white floors had the highest coefficient and different colors had significantly different light reflection coefficients (p<0.05). In small classrooms, the surface light reflection coefficient is positive related to the light intensity (p<0.05). In medium-sized classrooms, it was found that the light intensity from artificial light was significantly positiverelated to the light intensity (p<0.05). The intensity of light is influenced by the reflection coefficient. This is caused by the floor and wall colors, in addition to the illumination from light bulbs and outside light. Classrooms should measure light intensity to a standard value of 400-500 lux for reading and writing tasks. The classrooms should have white walls, and if the light measurement is insufficient, should increase the light bulb or the wattage of the light, which is artificial light.
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