Reddit mentions of Aramox Diving Flashlight 18000 Lumen IPX8 Scuba Dive Lights 500M Underwater LED Flashlight Submersible Lights for Outdoor Under Water Sports

I have thought about this a LOT recently. I was considering investing in a new camera rig, since I'll need one for not just scuba but other things as well. $1600 Nikon Z7, $4000 Nauticam housing, $600 Atomos Ninja V, $2000 Ninja housing, $2600 for two Keldan lights, plus a couple hundred more for the arms and floats. The costs for many things are absurd in scuba, but especially for photography/videography. What I decided was to get a Hero 7 and make my own dive housing, which took about two weeks of time to design but ultimately will only cost me approximately $560 in parts.

As part of that, I decided to go with some inexpensive dive lights from Amazon for about $65/each. I actually tried the Hero 7 with the supersuit plus this light in my hand using the goodman handle, but even with the image stabilization the footage was too shakey for my tastes, and overall it's really hard to control a GoPro with one hand and a light in another hand. This is why I decided to build my own rig.

Regarding the light though, there are several vendors selling the same one and some of the reviews caused me concern about leaks, but I have tested 2 of them in the water for 3 dives now, as deep as 60 feet and had no issues. What I did however was put a liberal amount of silicon grease in the threads to really make sure it's sealed (and even a little around the edge of the glass between the glass and the metal frame), and I would recommend doing the same. They are very bright and have attachments to connect to ball adapters or be used in-hand with a goodman handle, but their primary downside compared to professional lights is that they will dim as the batteries get drained further and further into the dive. If you are looking for an inexpensive, powerful solution however, that is what worked for me.

My custom Hero 7 rig isn't built yet (still waiting for a part from China) but when I finish it and fully test it I'll post about it here in /r/diving and/or /r/scuba. In a nutshell it has a 10" 2k screen contained in a sealed acrylic frame, attached to an acrylic housing which is itself flooded, only there to add flotation and provide some additional utility/storage and support the arms/lights along with the attachment point for the Hero 7 which is inside of its own slightly modified supersuit housing. It is being built with a single 3/8" thick 24"x48" cast acrylic sheet. I'd be glad to share my work-in-progress notes if you want to do something of your own before I wrap up in the next month or two. Just let me know.