A solid state lighting system controls overall light output level in a step-wise manner by discretely controlling the ON/OFF state of its light emitters. Solid state emitters that are ON at a given time are set and kept at a level intended to produce a desired output characteristic, e.g. at a level to...http://www.google.com.au/patents/US7560677?utm_source=gb-gplus-sharePatent US7560677 - Step-wise intensity control of a solid state lighting system
