A light pipe fixture with adjustable beam spreads comprises a bayonet assembly having a generally tubular coupling for receiving a light-dispensing end of a light pipe, and a receiver assembly. The receiver assembly has a generally tubular coupling for receiving therewithin the bayonet assembly coupling at adjustable levels of penetration of the bayonet assembly coupling within the receiver assembly coupling. The receiver assembly further comprises an optical lens and a hollow portion for focusing a light beam from the end of the light pipe through the lens. The radial interior surface of the receiver assembly coupling and the radial exterior surface of the bayonet assembly coupling may be configured so the receiver assembly coupling slidably and lockingly receives the bayonet assembly coupling in any of a plurality of positions along the length of the receiver assembly coupling.