Tuning a bias voltage supplied to a series of one or more LEDs in a constant current LED pulsing drive circuit may comprise the steps of: (A) setting the bias voltage to a test value, the test value being at least equal to the sum of the bias voltage second component and the maximum forward voltage rating of each of the one or more LEDs; (B) measuring an intermediate voltage present between the series of one or more LEDs and the constant current source when the LEDs are turned on; (C) determining if the intermediate voltage exceeds the second component of the bias voltage; and (D) upon determining the intermediate voltage exceeds the second component of the bias voltage, reducing the bias voltage applied to the one or more LEDs by an amount necessary to cause the intermediate voltage to equal the second component of the bias voltage.