ANALYSIS OF BEDROOM LIGHT ILLUMINATION AND SLEEP QUALITY OF ELDERLY PEOPLE AT BEDTIME1

1Increasing age and physiological deterioration make it a safety problem for the elderly to go to the bathroom at night. In order to ensure the safety for the elderly, it is necessary to provide a certain de-gree of vertical illumination of the eyes and ade-quate illumination of the ground. However, exces-sive illumination also affects the rhythm and sleep continuity. This study aims to ensure the safety and rhythmic health of the elderly during the night, and total of 80 senior citizens were studied. In this study, the type of bedroom light fixtures and night time use were counted, and the sleep quality of older adults was analysed in combination with the Pitts-burgh Sleep Quality Index (PSQI) and measured il-luminance data. Lighting graphs help to express the problems. The results showed that the mean verti-cal illuminance of the eyes with the lights on was 75.24 lx (SD=+/- 46.81), and the illuminance of the ground was 25.72 lx (SD=+/- 14.54). 66.25 % of the older adults use the table lamps in the bedroom. The problems with all kinds of the lamps were analysed light diagrams. The result of the PSQI question-naire showed a mean score of 8.10 +/- 2.463, which scores too high and means bad sleeping condition. There is a high level of ocular illuminance, which affects the rhythm of the elderly people, and the ground illuminance is insufficient, which makes it difficult for the elderly people to notice unsafe fac- tors such as the debris on the ground.