21. The system of claim 20 , wherein each of the red, green and blue light emitting elements comprises a three separate laser diodes or three separate light emitting diodes.
20. The system of claim 19 , further comprising: a red light emitting element; a green light emitting element; and a blue light emitting element; wherein each of the red, green and blue light emitting elements is driven by a current output of a different one of the first, second and third DACs.