HOW TO TEST

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.

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.

20-normal-2 — Under normal light there should be NO UV fluorescence visible to the naked eye.

20-uv-390-2 — Far too much visible violet light (interference) produced due poor quality UV LEDs thus producing a poor quality result, with much of any fluorescence generated masked by the visible purple glare. Many people mistakenly believe that a bright purple 'visible' beam means a high UV performance. The reverse in actually the case and the visible purple glare is an unwanted bi-product resulting from poor quality UV LEDs!

20-uv-380-2 — This range produces a much higher quality of UV light with very little purple glare; rather a cleaner, softer, whiter light that allows a greater range of fluorescence to show through. Notice the Red/Yellow '20' and the little multiple fibres that are now revealed under a high quality UV light source.

20-uv-365-2 — These 'Professional' UV Lamps produce a Very High Quality UV source at 365nm; the optimum frequency for fluorescence. Very little visible light is produced to mask or interfere with the resulting fluorescence. Notice that with this 'pure' UV frequency the '20' and fibres are much brighter than with any other frequency.

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

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HOW TO TEST