Technology Discussion

Generally there are two ways of experiencing underwater fluorescence, either with invisible (ultraviolet) or with visible (usually blue) excitation light.
In the case of ultraviolet excitation light (with wavelengths <400 nm), no filters are needed for your mask and camera. You may need a “Wood’s Glass” type of excitation filter on your torch, though, in case you use a torch with white light (or a strobe), which should have lots of output in the ultraviolet range of the spectrum, such as HID (high intensity discharge) lights.
The same can be done with a white light (or strobe) and a blue excitation filter in order to obtain a blue excitation light, by the way.
However, using a white light in combination with an excitation filter that will throw away most of the torch’s light output is not as efficient as using a torch which has the desired range of wavelengths in the first place.

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