Some studies have explored gender effect in the relationships between lighting conditions and cognitive peformance.20,26,27 Knez and Kers28 suggested that lighting conditions may convey different meanings to different genders. Wang et al.26 found the existence of gender differences in their psychological responses to lighting conditions. Gender differences in responding to CCT conditions have been reported in an earlier research by Knez and Enmarker.29 In their study, 20 male and 20 female subjects were asked to perform a 2-h cognitive task (the lighting condition is 3000 or 4000 K; maintaining illuminance at 1500 lux). Subjects reported their evaluation of the room light after the task, and they also rated their mood before and after the task. Comparing the mood change before and after the task, it is found that the 4000 K condition is better for females in maintaining the positive mood and not inducing negative mood, whereas for males, the 3000 K condition is better. In addition, it is found that females consider the 4000 K lighting to be warmer than the 3000 K lighting, whereas males feel oppositely that the 3000 K condition is warmer than the 4000 K condition. Their findings indicate that different genders may perceive lighting differently and may have different psychological responses to CCTs.