A light pipe based projection engine includes a X-prism transmitting substantially light of a useful polarization in an output direction and reflecting substantially light of a non-useful polarization in a first orthogonal direction substantially orthogonal to the output direction. An initial reflector may reflect the non-said low, said medium, and said high bands of wavelengths in a second orthogonal direction substantially orthogonal to the output direction and the first orthogonal direction, and a final reflector may reflect the non-said low, said medium, and said high bands of wavelengths in the output direction. The non-said low, said medium, and said high bands of wavelengths may be rotated substantially to light of the useful polarization by the initial and final reflectors.