I probably had the first version of this light that I attached to my GoPro and didn't drop it in water for more than 30 minutes. It stayed on for maybe a full minute, never to work again. I chose this latest model because it was so cheap. This light is great. I have used it several times with my Gopro 3+ in salt water. I lowered it to a depth of 212 feet. The light stays on for about 2-3 hours at the highest level. The beam is wide and illuminates the dark well, maybe 3ft but I think up to 8ft total (difficult to tell distance from the underwater video I took). Originally I wanted to see what the bottom of the ocean looks like. for example hoping to catch a halibut but found that I enjoy watching all the underwater life this rig catches (Gopro Neewer light). photo approx. 150'
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