An Ultra Violet Blacklight

Using our simple test, you will be able to determine the frequency band of your UV black light

As you can see from these examples of Blue, Red and Green, the best colour intensity and brightness comes from the 365-380nm UV Frequency range.

Normal Light
UV 390 - 405nm
UV 380 - 390nm
UV 365 - 380nm

In this demonstration using a British £20 note, it is possible to see the visual differences between the UV wavelengths and is therefore a simple and effective way of testing (or determining) the approximate operating wavelength of a UV LED torch or UV lamp.

This video test shows the differences in UV quality between 3 UV LED Torches.

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