There is disclosed an optic system for illuminating a DMD array in a xerographic printing process consisting of an array of LED emitters (80) constructed to efficiently replace the conventional tungsten source used in prior art. The array can be geometrically configured or electrically operated by strobing or varying the brightness of individual pixels (71) to compensate for other system optical deficiencies and results in improved printing process. By exposure strobing the LED source correction for fuzzy line edges can be achieved.