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1 Copyright ? #### by ASME Proceedings of Forum 2001: Solar Energy: The Power to Choose April 21-25, 2001, Washington, DC PRELIMINARY RESULTS ON LUMINAIRE DESIGNS FOR HYBRID SOLAR LIGHTING SYSTEMS D. D. Earl, Oak Ridge National Laboratory 2360 Cherahala Blvd. Knoxville, TN 37932 J. D. Muhs, Oak Ridge National Laboratory 2360 Cherahala Blvd. Knoxville, TN 37932 ABSTRACT We report on the design of two hybrid lighting luminaires that blend light from a fiber optic end-emitted solar source with electric T8 fluorescent lamps. Both designs involve the retrofit of mercially-available recessed fluorescent luminaire with minimal reductions in the original luminaire’s optical efficiency. Two methods for high-angle dispersion of fiber optic end- emitted solar light are described and the resulting spatial intensity distributions, simulated using ZEMAX, pared with standard cylindrical fluorescent tubes. Differences in spatial intensity distribution are qualitatively characterized and potential design improvements discussed. INTRODUCTION We earlier reported a new hybrid solar lighting system which resulted in energy savings through direct utilization of visible solar light for internal lighting 1,2, see Figure 1. A major step toward the realization of using fiber optic transported solar light for internal lighting purposes involves the development of a hy