A lubricating system is affixed to and rotates with a rotary drive shaft, and provides automatic lubrication of the rotating bearings of a universal joint or similar articulated juncture in the shaft while the shaft is rotating. The DMDs each receive a primary color and selectively reflects some light of that color, thereby shaping the light that is projected onto the stage. Since the hollow has a depth substantially equal to a thickness of the pre-amplifier, the bonding wire from the pre-amplifier to the surface of the stem may become shortest to reduce the parasitic inductance of the bonding wire and to enhance the high frequency performance of the ROSA. Each thin-sheet fin comprises a folded engaging portion and a dissipating portion connecting with the engaging portion.