High intensity discharge lamp and excitation coil configuration.

摘要

The centroid (a) of the excitation coil of an electrodeless high intensity discharge lamp is offset from the centroid (b) of the arc tube a predetermined distance (d) along a common central axis in order to maximize light output. In a preferred embodiment, i.e., for a lamp configured to direct light downward, the centroid of the excitation coil is situated above the centroid of a spheroidal arc tube; and the upper hemisphere of the arc tube is coated with a reflective coating (30) in order to further maximize light output. <IMAGE>