US Patent 6857772 High performance light engine

A surgical lighting system including overhead surgical lights having integrating cavities which capture metal halide arc lamp optical energy and output spatially uniform optical energy to reflectors which direct the optic energy to a common surgical illumination region, a surgical light port system having illuminating ports, and a thermal dissipater. The surgical lighting system includes power back-up systems and light sources with multiple lamps that are automatically sequenced to provide constant surgical illumination.