| 摘要 |
A dual lamp illumination system, in which the output beams of two lamps with collimating reflectors are directed into one another to produce a combined beam, and in which plane mirrors set at 90 degrees to one another are inserted half way into the combined beam. Thus half of the combined beam is directed out of the path of the combined beam to form a new combined beam having substantially the same etendue as the original combined beam. The the light rays in the unreflected half of the original combined beam are recycled until they strike one of the plane surfaces, and are thence reflected out into the new combined beam.
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