Ring light VS Ring Flash ..
Often the same unit performs both functions .
Unfortunately as flash units most of the cheap ones bite too hard . Most alleged reviews are little more than unboxings ( useless )
One thing to watch for with a ring flash is shutter sync speed ( you dont want 1/60 ) , so beware .
Ring lights , shutter speed is not affected . and they produce what light they produce ..
You really want to find a product review that does not suck hard .
Otherwise you may be better served by a decent LED flashlight .