I’m guessing this LED panel is primarily intended for retrofitting in traditional fluorescent and tungsten bulkhead lights, but it could also find use as a backlight in a lightbox. It’s not got an isolated supply, so it should be regarded as being live with reference to ground and mounted in a manner that does not pose a shock risk.
In Europe the Quicktest is available from most large electronic component suppliers like CPC, RS, Rapid Electronics etc.
A Quicktest with US/Canadian colours is available on eBay at:-
And a three phase US/Canadian one too:-
The LED rings and other styles can be found with this generic ebay search:-
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