An illumination system includes a first light source, a second light
source, a first light integrating device and a second light integrating
device. Each light integrating device includes an input aperture at an
input end for receiving input light and a turning mirror at an output end
for reflecting light onto an output aperture where the output aperture is
positioned in a direction perpendicular to the input aperture. The
illumination system further includes a first reflective mirror and a
second reflective mirror each coupled to direct light from the respective
light source into the input aperture of the respective light integrating
device. The illumination system includes a third light integrating device
including an input aperture optically coupled to the output apertures of
the first and second light integrating devices. The input aperture of the
third light integrating device receives light collected by the first and
second light integrating devices.