reliability seems to be an issue with these and other cheap torches/lights. google will reveal all. that aside, 1400 lumen, even if it proves to be accurate is woefully inadequate for your semi-professional needs.
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\But there aren't that many people with 4K monitors yet. I don't have one and I'll be editing the footage at 4K but I would never be seeing it at 4K so I don't know if that's such an advantage.
Also the fact that you can only shoot at 30FPS in 4K is not very good. Sometimes UW shoots need to be slowed down.
But you guys think that there's not much difference between the video quality of the GoPro Hero 4 Black and the Sony Rx-100 II ?
By the way here's a video of the GoPro Hero 4 with a red filter: [video=youtube;d7VqtLSODnA]https://www.youtube.com/watch?v=d7VqtLSODnA [/video]
For me it doesn't look good enough, I would even say it looks worst with the red filter in most shoots .
Here's a video of the Sony RX-100 II underwater:
[video=youtube;geNFJVwypfg]https://www.youtube.com/watch?v=geNFJVwypfg[/video]