LED Light Recycling: Some General Design Guidelines

The concept of light recycling has been misunderstood by many who work in the industry as they believe it would violate the brightness principle. This paper first tries to dispel that myth by providing an intuitive interpretation of the brightness principle and hence showing that light recycling is not a violation of this principle. It then goes on to present some general design guidelines as to how and if light recycling can be used in a particular system to enhance its throughput. A highly efficient (with near 100% recycling efficiency) light recycling system and some experimental results are also presented at the end.