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Hi, I am about to use this light to produce a short caving film. The light will be used both topside and UW (on a 4k camera rig) in an underground lake. Not at any deep depth. The torch itself is supposed to be good to 100m (it's got a double O-ring seal, magnetic switch etc). Anyway I just wrote some blurb and did some quick initial tests for temperature (not as in K) for how hot it gets if used topside. The build quality looks good. But why I got it is because it has a UV function (un filtered 365nm) and I want to use this to highlight some basic fluorescence within this particular cave system. It's hot off the press from these guys at Xtar. Not sure what others think about their dive/video lights but this one appears initially quite good (ask me again after taking it underground for a while LOL!). For this project I needed to use a more powerful light than my old TUSA's and I had to have a magnetic switch The front optic/port is coated (can't be seen in this image) There is of course a sturdy 1/4 inch 20 tripod mount. I'd like to see a bigger charger for this type of 26650 battery but the supplied charge does work, one just has to make sure the battery doesn't "jump up" due to the springiness of the charger's contact at the -ve end. Anyway here is also a link to more details about this light. https://hardcorecampingtools.blogspot.com/2020/09/xtar-d30-1600-scuba-divers-video-light.html