A 3D projection system, comprising: in a first space, a first projector switching between projecting left eye content and right eye content for a first 3D projected image, the left eye content comprising a frame intended for a viewer's left eye and the right eye content comprising a frame intended for a viewer's right eye corresponding to the left eye frame; in a second space, a second projector switching between projecting left eye content and right content for a second 3D projected image, the left eye content comprising a frame intended for a viewer's left eye and the right eye content comprising a frame intended for a viewer's right eye corresponding to the left eye frame; and a multi-theater light source apparatus, the apparatus comprising: a first light source outputting white light composed of three narrowband RGB components configured for use by the projectors to display the respective left eye content associated with the first and second 3D projected images; a second light source outputting, concurrently with the outputting of the light from the first light source, white light composed of three narrowband RGB components configured for use by the projectors to display the respective right eye content associated with the first and second 3D projected images; and a switching device receiving the light output from the first light source and the light output from the second light source and, in a first operating state, directing the light output from the first light source toward a first one of the projectors and the light output from the second light source toward a second one of the projectors and, in a second operating state, directing the light output from the first light source toward the second one of the projectors and the light output from the second light source toward the first one of the projectors. in a first space, a first projector switching between projecting left eye content and right eye content for a first 3D projected image, the left eye content comprising a frame intended for a viewer's left eye and the right eye content comprising a frame intended for a viewer's right eye corresponding to the left eye frame; in a second space, a second projector switching between projecting left eye content and right content for a second 3D projected image, the left eye content comprising a frame intended for a viewer's left eye and the right eye content comprising a frame intended for a viewer's right eye corresponding to the left eye frame; and a multi-theater light source apparatus, the apparatus comprising: a first light source outputting white light composed of three narrowband RGB components configured for use by the projectors to display the respective left eye content associated with the first and second 3D projected images; a second light source outputting, concurrently with the outputting of the light from the first light source, white light composed of three narrowband RGB components configured for use by the projectors to display the respective right eye content associated with the first and second 3D projected images; and a switching device receiving the light output from the first light source and the light output from the second light source and, in a first operating state, directing the light output from the first light source toward a first one of the projectors and the light output from the second light source toward a second one of the projectors and, in a second operating state, directing the light output from the first light source toward the second one of the projectors and the light output from the second light source toward the first one of the projectors. a first light source outputting white light composed of three narrowband RGB components configured for use by the projectors to display the respective left eye content associated with the first and second 3D projected images; a second light source outputting, concurrently with the outputting of the light from the first light source, white light composed of three narrowband RGB components configured for use by the projectors to display the respective right eye content associated with the first and second 3D projected images; and a switching device receiving the light output from the first light source and the light output from the second light source and, in a first operating state, directing the light output from the first light source toward a first one of the projectors and the light output from the second light source toward a second one of the projectors and, in a second operating state, directing the light output from the first light source toward the second one of the projectors and the light output from the second light source toward the first one of the projectors.