This is my opinion on SB post. Also Yupard is not on my list of great lights.
I recently watched a vid by Old-Lumens (here on BLF) regarding the terrible quality of one of their lights (see thread). I also bought (2) of their dive lights - when I received them I was so upset that I asked for a 100% refund. Lucky I didn't lose any money.
Did you read some of the high reviews from the buyers of that Yupard dive light? Just know that most likely those reviewers aren't flashaholics. This happens a lot with flashlight reviews on Amazon etc. They buy their first light with a Cree XM-L emitter and it's the brightest light they've ever seen. You'll have a better sense of what's good from the flashlight forums.
The ones I recommended are much brighter and more dependable - these features may not be important to every diver, especially brightness.
Did you see this line of lights? Securitylng thread