In the midst of the current environment-conscious era, sustainable architecture and sustainable engineering are seen as the vehicle to creating green buildings. This paper investigates the role of daylighting systems in green design. The paper argues that: engineering of daylighting systems is necessary to optimize the use of energy in buildings. The use of engineering principles in the design for daylight may overcome the current barriers to effective incorporation of daylighting systems in

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... ldings; in academia and in practice. That is why more emphasis should be given to experimental research in the field of daylighting systems in order to establish a set of rigorous engineering principles for the design of daylighting systems. In the end, the paper gives a brief description of a new model of an artificial sky dome that is designed by OSU faculty. This artificial sky dome is now under construction and will be used by undergraduate and graduate students to perform experimental research in the field of daylighting design.