| 摘要 |
<p>An arc tube for a high intensity discharge lamp. The arc tube has a hermetically sealed body formed from a vitreous material subject to devitrification. at least two oppositely disposed electrodes are sealed in the body. An arc generating and sustaining medium is provided in the body and operates to produce visible light when an electric current is applied to the electrodes. The arc tube has a given color rendering index, and at least a portion of the medium comprises a color correcting component of lithium iodide which contributes no only to the given color rendering index but which also acts as a devitrification agent. The improvement comprises an anti-devitrification component in the medium, the anti-devitrification component having a minimal detrimental effect on the given color rendering index while increasing the life of the arc tube. <IMAGE></p> |
