 It was invented by Lester A. Dine in 1952 for use in dental photography, but now is commonly used in applications such as macro, portrait and fashion photography.As the efficiency of light sources, and the sensitivity of photographic imaging sensors, increased, the use of a continuous ring light instead of a flash increased.A ring light has the same advantages as a ring flash, but produces continuous light at a lower intensity, so the image can be examined before taking the photograph.