A big issue with these things is that a lot of people get low-cost ring-lights that are really just a bunch of LEDs. Some of them are so dim they don't even publish their guide number, or the guide number isn't anything close to the amount of light from a real flash. If you're hoping to do macro shots, then you'll need a lot of light to allow small apertures that give you more DOF, and you want to use real flash with a pretty high guide number.
|Hot Air Balloons Over Bagan by User9320321874|
|Yellow Warbler by LeeS|
from A Big Year - birds
|Waiting for the Parade by tcoker1103|
from - La Vida Loca - (Black and White Street Photography+ A Border)