Compact torch switches between UV A,B, and C.

[Doug A]

Couldn't find this discussed anywhere. Instead of having all three LEDS this unit uses sheets to change light output. This sounds really neat.

https://www.fluorescents.com/products-the-triple.html. Doesn't seem to be a filter. I don't totally understand how it works. 

Thanks,

Doug A

[Andy Perrin]

It explains that the sheets are fluorescent screens that downconvert UV-C to UV-B or UV-A respectively. Fluorescence does not always go UV->visible. It can also be shorter UV to longer UV. 

[Doug A]

Makes sense...thanks for the explanation. Wouldn't this conversion be fairly inefficient? Seems like this wouldn't put out near the light of a Nemo. Still, interesting technology and it would be useful, for previewing a subject, to decide which dedicated light source to use.

Thanks,

Doug A

[Andy Perrin]

Yes, it would be quite inefficient. But convenient.

[OlDoinyo]

Would the UVB or -C actually go through that front filter?

[dabateman]

The front filter is ZWB3,  so yes. Even 405nm will pass through it.