This document provides information on various types of stage lighting instruments and their uses: - A parcan is used for general wash lighting and has aesthetics that make it preferable to a Fresnel in some contexts like music performances. - An LED parcan is energy efficient and can change colors digitally via DMX, replacing the need for gels. - A Source Four spotlight can isolate an actor on stage better than a floodlight by lighting a defined area using its adjustable shutters. - Various fixtures like Fresnels, profiles, and convex lights can be used for general wash lighting or isolating areas using barn doors, with some having replacement potential if another fixture is unavailable.