Amazing ten-volt mercury discharge UVC lamp. (GTL3)

I thought it was maybe a listing error, but this little lamp really does run at about 10V when it's warmed up. It uses an internal filament with a thermally emmissive coating to lower the voltage at which a mercury discharge can occur.
Remember that this lamp puts out UVC light which can cause skin and eye damage by direct exposure.

Here's a generic eBay search link:-
https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=10v+germicidal&_sacat=0

Russell's page:-
http://russellsrandomthoughts.blogspot.com/2013/05/the-gtl3-bulb-simple-and-inexpensive.html

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