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wrote:

How can one safely tell if a UV lamp is working?

You can't (without vast expense) -- output falls with time, so
bactericidal UV lamps are time-rated. I'm not sure about algae though?

As to a simple "Is it still working electrically" then they nearly all
have visible glow too. If you can't defeat the interlocks, then stick a
piece of phosphorescent plastic in there and see if it's charged up by
it. It's nearly Hallowen, I'm sure you can find some glowing vampire
teeth.