Robert A. Birchler was named plant manager at Super Vision International Inc., an Orlando, Fla.-based developer of fiber optic and LED lighting.   . . .   Candela Corp.'s GentleYAG laser has received 510(k) marketing clearance from the US Food and Drug Administration (FDA) for hair removal in the treatment of pseudofolliculitis barbae (PFB), or inflammation from ingrown hairs.