Patent ID: 8142050

Claim:
A phosphor point source element that is rotated to provide a high intensity point source of phosphor radiation from an operational track on the phosphor point source element, the phosphor point source element comprising: a substrate; and a light emitting phosphor supported by the substrate, and arranged in a circular operational track region on the substrate, wherein: the light emitting phosphor comprises phosphor particles; the operational track region comprises an operational surface that can be illuminated to excite the light emitting phosphor; the phosphor particles in the operational track region are arranged in a tightly packed particle arrangement fixed in position adjacent to the operational surface; and the operational surface comprises a surface of the tightly packed particle arrangement, and is formed such that it is nominally flat, wherein the tightly packed particle arrangement is substantially similar to a packing arrangement that would be provided by forcing the phosphor particles against one another in the vicinity of the operational track region.