FACETED CERAMIC HID LAMP

摘要

A high intensity discharge lamp includes a ceramic envelope that defines an enclosed volume that is filled with a pressurized gas, the envelope having an exterior with axial poles and an equator and, when viewed in longitudinal cross section, plural exterior steps extending in series from the respective axial pole to the equator, each of the steps having a flat surface that is angled to refract light from inside the envelope toward a plane of the equator. The flat surfaces may be planar (plural facets in concentric tiers) or annular and the envelope may have a spherical interior surface. The lamp may have a reflector with an aperture that is aligned with the respective axial pole.