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Will the blue light be of a wave length that will fluoresce?
Yes, I've tested this off Dorset and even certain growth there lights up.
Late post I know.
I've the previous version of these I use on my HugyFot GoPro. Had them for 3 years now, taken down to 75m. Not missed a beat.
I've had a pair for a couple of years - rinse them very well - especially the buttons and they'll be ok. I use them off the camera so they get knocked about but have ben fine so far. For the price they're almost consumables!