I have the used the UK SuperQ as a mask light and on my harness as backup lights. I was having issues with them getting moisture in them on deeper dives 200+. However I sent them back to UK and they were replaced no questions asked. I been using the Light Monkey 2W Leds and they are great no issues. Just be aware if your mask lights on try to avoid blinding a buddy if your diving with one. I use the mask light when working on a artifact and need hands free or when making a jump in a cave.