Thermally insulating lead wire for ceramic metal halide electrodes

摘要

A significant reduction in thermal energy loss along the legs or ends of the arctubes in a CMH lamp is achieved in the present invention. The diameter of a mandrel (36, 40) is significantly reduced for CMH lamps. Either a single overwind (32) or multiple overwind layers (42) are used. Since the thermal conductivity of the mandrel greatly exceeds that of the overwind, the axial thermal conductivity will scale like the cross sectional area of the mandrel alone.