ABSTRACT

The effects of both illuminance and correlated color tcmpcrature (CCT) on people's (aged 20-25) performancc of color discrimination wcrc investigatcd. FM lOO-hue test was used as a task under the combined conditions with 3 CCTs( 3000K, 6500K and 8000K) and 3 illuminance levels (lOlx, 100lx, 1000lx). The results showed that people's performance of color discrimination improved with increasing illuminance, as well as increasing CCT. It was also proved that color rendering index (CRl) of the light sources cannot reflect the effect of spcctral power distribution (SPD) on color discrimination. At low illuminance( 1 Olx), CCT had significant effccts on people's performance and preference, that is, the performance increased with increased CCT, though preference decreased. The study appeals for a complete consideration in lighting design for the effects of both illuminancc and CCT, and people's need for performance and preference, especially meaningful for a field with low light levels, such as cockpit, military working places, etc·.