Abstract: An étendue efficient angle conversion system that operates in a quasi-imaging mode. This system is capable of generating angular and spatial axial asymmetric output beams and is also capable of incorporating therein optional color reformatting capabilities. With the aid of anamorphic beam transformers such asymmetric beams can further be reformatted to spatially and angularily match particular illumination needs of a target. This system can further be applied to the design of fiber optic illumination systems and projection display systems and can further be combined with delivery efficiency maximization concepts. In addition, delivery efficiency improvements of light engines can be obtained with the use of optimized lamp, reflector, integrators, anamorphic beam transformers, coupling optics, etc.