Comparison of user satisfaction with four different lighting concepts

This study aims at comparing user satisfaction for different lighting concepts in an office environment. The lighting concepts being compared are a conventional static lighting concept from ceiling mounted luminaires against three different types of dynamic task lighting concepts, the first providing occupant controlled task illuminance, the second concept providing occupant controlled CCT and the third providing automatically controlled CCT. Another aim is to identify which of the four lighting concepts is rated as most preferred by the test subjects. Subjects tested all four lighting concepts and questionnaires were used for rating of the concepts. Adjustable CCT of the task light was the most preferred lighting concept followed by adjustable task illuminance. Automatically controlled task CCT and conventional lighting were the least preferred. User satisfaction ratings for the lighting concepts are in the following order; Adjustable task CCT, adjustable task illuminance, automatic control of task CCT and conventional lighting.