Canister lights?

[systematic.entropy]

Broken lamp or burnout?

On the stage side, we use arc lamps for most of the moving lights.  Phillips sends along a alcohol wipe to clean the lamp after installation.  Even if you don't touch the lamp with bare fingers, there can still be residues from the packaging, which can burn into the glass, and kill the lamp.
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Generally, broken from shock (impact). Plus, they are extremely sensitive to heat. The Dive Rites NEED to be turned on in water, otherwise you risk having a very very very sensitive to element to shock. Plus, they have the startup and cool off time. Of course there is some debate about what those times actually are; some say if you turn it on, you have to have it on for a least 45sec, and if you turn it off, you can't turn it back on for two minutes, etc., there are a bunch of theories out there. But, even the bulb manufacturer says they do have a proper time to on and time to off. I'll try to dig out those numbers if anyone is really interested.

In my experience, even turning the light off in the water, covering the light head with a can coozy, getting onto a dive boat, setting down my gear as I normally would, I usually give the Dive Rite bulb a 60/40 chance of survival, less if a boat crew is "helping" me doff my gear. My Salvo, never had a single issue with. Ever.