Patent ID: 6781312
Filing Date: 2004-08-24
Classification: H01J

Abstract:
A horizontally burning, high intensity discharge lamp having (a) a base; (b) a light transparent outer envelope; and (c) an arc tube operatively mounted therein,said base and said arc tube being rotationally fixed relative to each other and said base having means for predetermining the rotational orientation thereof when operatively mounted in a fixture, said arc tube having (i) a pair of spaced apart coaxial electrodes, (ii) an upper portion longitudinally conforming generally between said electrodes to the shape of the arc to be drawn therebetween in the operation of the lamp, and (iii) a flattened lower portion, the distance at all cross-sectional locations between said electrodes between the flattened lower portion and the axis of said electrodes being less than the distance between the upper portion and the axis of said electrodes.