A Study of design guideline for lighting temperature office meeting room to increase meeting efficiency at night.

Abstract

Individuals of working age increasingly tend to engage in extended working hours, sometimes continuing into the nighttime, especially during prolonged on-site meetings. Under such conditions, artificial lighting becomes the primary source of illumination. Previous research has shown that lighting conditions can significantly affect human health, cognitive function, and emotional well-being. The objectives of this study include: 1) to investigate the effect of lighting color temperature as a contributing factor to meeting performance at night and 2) to recommend suitable lighting color temperature guidelines for office meeting room during nighttime hours. This experimental study involved 20 working-age participants, 10 males and 10 females, aged between 25 and 42 years. Data were collected in a standard office meeting room. Participants initially assessed their fatigue severity levels before starting three types of performance tests: complex thinking, concentration, and creative thinking. These tests were conducted under two lighting Scenarios: 4000K and 6500K, with each condition tested twice and short breaks between sessions. Results found that 4000K lighting enhances concentration and creativity, while 6500K lighting is more effective for complex thinking tasks. Further analysis revealed that 6500K lighting led to greater accuracy in concentration tasks, whereas 4000K lighting resulted in faster performance in those tasks. These findings provide practical implications for improving meeting effectiveness in office environments during nighttime hours.