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How to kill HPS lamp

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dor123:
One thing that i don't succeed to understand, is why severe overdriving a HPS lamp, causing the sodium inside the arctube to leak inside the outerbulb???
Also, why the arctube disconnected from the frame in several videos???

Medved:
The arctube is designed to certain pressure and temperature. Overdriving increase both, so no wonder the material give up.
Note, then in normal HPS the tube wall is way closer to the arc core then e.g. in CMH, so if the arc load increase, it may easilly go above the material limit...

And why it disconnected? Because the high current does not overload only the arctube, but the thin interconnection elements as well. And as these are poorly cooled (there is hard vacuum in the outer) and are made from rather ordinary materials (and not the high melting point tungsten as main electrodes), they start to melt (or better say the electromigration cause them to crack)

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