Patent ID: 6736527
Filing Date: 2004-05-18
Classification: F21V,G03B,H01J

Abstract:
A method of cooling a D.C. arc lamp having an anode end portion, a cathode end portion coaxial with the anode end portion, and a glass envelope that includes a bulb between said end portions:the method comprising the steps of: supporting the lamp in a collector within a lamphouse by means of a support that includes a shroud for one of said end portions of the lamp so that said one end portion and the bulb are within the collector and the lamp extends through an annular opening in the collector with the other lamp end portion outside the collector, the shroud providing an annular air space around that end portion of the lamp and having an inlet for cooling air and an annular air outlet that is directed towards the bulb of the envelope; and, causing cooling air to flow through the shroud from said inlet to said outlet, air leaving the outlet flowing over the bulb to said annular opening in the collector as an annular airstream for cooling the lamp.