Light can have acute effects on human performance, including task performance, alertness and circadian phase shift. Most studies have investigated these effects using static light. This study investigates the effects of dynamic light with different cycle times and different ranges of correlated colour temperature on human alertness and task performance. Ten participants took part in the experiment using six conditions of dynamic light with each observing session lasting 4.5 hours. An electroencephelogram, measurements of critical flicker frequency, performance on various cognitive tasks and alertness and sleepiness questionnaires were used to evaluate the human responses. The results showed that participants appeared more alert and performed better under lighting of higher correlated colour temperature range but different correlated colour temperature cycle times had little effect.

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