High intensity discharge lamp with integral means for arc extinguishing

摘要

A high intensity discharge lamp having an inner tube in which a discharge takes place to produce visible light and ultraviolet radiation and an outer envelope which blocks harmful ultraviolet radiation. An oxidizable element of a refractory metal is provided in the voltage supply to the arc tube internally of the outer envelope which element oxidizes when the outer envelope is broken and burns through to remove the voltage from the arc tube and to extinguish the arc.