A method of storing calibrated optical parameters is presented. In some
embodiments, calibrated optical parameters are stored in place of stored
parameters. In some embodiments, averages between the calibrated
operating parameters and stored optical parameters are stored. In other
embodiments, the stored optical parameters are allowed to vary only by a
maximum amount. In some embodiments, if the calibrated parameters vary by
more than threshold values, then the calibrated parameters are not
stored.