Author Topic: Lithium impurity in QMH lamps: Question  (Read 111 times)
dor123
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Lithium impurity in QMH lamps: Question « on: September 15, 2025, 11:44:24 AM » Author: dor123
Is there any advantage for the lithium impurity in white QMH lamps?
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James
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Re: Lithium impurity in QMH lamps: Question « Reply #1 on: September 16, 2025, 04:56:23 PM » Author: James
Yes and no.  It improves the CRI quite dramatically, but also reduces life.  Lithium iodide is far more corrosive towards quartz than sodium iodide, due to its smaller atoms which more easily penetrate and attack the silica structure.
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dor123
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Re: Lithium impurity in QMH lamps: Question « Reply #2 on: Today at 04:55:26 AM » Author: dor123
Just a shame. However, the lithium that originates from the quartz isn't LiI. No?
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Re: Lithium impurity in QMH lamps: Question « Reply #3 on: Today at 04:56:30 PM » Author: James
Yes lithium is almost always present as an impurity in quartz, but often even more is added in the halide dose.
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Re: Lithium impurity in QMH lamps: Question « Reply #4 on: Today at 05:40:02 PM » Author: Ash
How does the Quartz withstand the Lithium ? I would expect it to be quite unhappy, considering that the most similar other elements are Sodium and Cesium ?
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