The ring light enlightens by casting an even light onto the designated area of a subject. This reduces or deecreases shadows in the face thus minimizing the blemishes, while also illuminating the eyes. This is the reason that ring lights are generally used in glamour shots, portraits, or even in videography for capturing only one item or subject.
As far as ring lights are concerned, you may pick or choose one for your smartphone from a wide range of prices. It starts from as low as $15. Furthermore, for a more substantial and better quality unit, the range is about $60-$150.