Someone in the USA has made a very helpful video on this topic. I recommend you watch it.
But first, I have some comments on the UV torches/flashlights used in the film. They are all low power UV flashlights. I used to offer the exact 3-in-1 torch she shows (it was FT2 UV torch), but no longer – for three reasons:
- First, shipping and the low Australian dollar made them very expensive – nearly $600 retail then, more now.
- Second, all three options in the 3-in-1 UV torches are weak (equivalent to FS2, FM2 and FL0 UV torches) compared to powerful single wavelength UV torches now available.
- Third, you can get three much more powerful SW, MW and LW UVtorches for much the same or even lower cost.
But all the information in the video is correct.