I have some experience with this type of video light. About a year ago I tried to figure out the expected real intensity of those $50ish video lights by looking up the actual LED modules they were using. I concluded that the individual emitters were probably Cree XLamp series or a convincing clone. It seemed like the actual modules have been discontinued by Cree, or were never authorized?
Based on what I was able to find I decided the "14-7" lights probably had the highest real intensity/$. Those are 14 LED modules, but only 6 white modules. Real size of the white modules are 3535 (9090 Metric) surface mount. The "7" is from the distinct 7 sub-emitters on the chips. This is as apposed to the "4" models, which only have 4 sub-emitters. I was never able to get a clean enough picture of the emitter of that single Chip-on-Board model to take a guess at the actual component they were using.
I don't have a way to test real intensity, but it looks like about 50-75% of rated based on my subjective view. They are
very bright, I suspect the modules are being over-driven given how hot the face gets. I would absolutely not keep them on in air. The buttons are very vulnerable to getting encrusted, requiring a fresh water soak and actuation after every salt water dive. Been down to slightly more than 100' without flooding the light, ... yet.
I'm pretty impressed they can even source the components for that cheap. I think just the LED modules would be >$100 wholesale in the US.
Picture of the face in case anyone is trying to match the exact "QH14-7" model:
