Recently got one of the Taiwan UV drop-ins from Manafont (SKU: 6239) to spot cat urine.
There seems to be quite some fluctuation concerning the quality of these drop-ins.
It appears I have received a lemon 
Mine does not really illuminate any bodily fluids (even when using orange sun glasses) or security markings on banknotes.
It produces a lot of visible light and gives me a roaring headache when used for longer than a couple of secondsā¦ even when wearing sunglasses.
Is it worth the trouble to contact Manafont about this?