In the year 1952 a man by the name Lester A. Dine invented the Ring Light, it was originally invented for the use of Dental photography. It is a circular light that fits around the lens or the protective glass of the source. By surrounding the lens or the protective glass, an equal distribution of the light with fewer shadows obtained. This is very useful in so many applications especially when shooting photos of small objects. A typical Ring Light consists of two main units, power unit and light source unit. The power unit could be a battery or a power pack. The light source unit is a circular shape group of small lights surrounding the lens of the light. Some of them have a diffuser or a focusing lamps.
LED (Light Emitting Diode) is a semiconductor light. It works by recombining electrons with electron holes within the device releasing energy in the form of photons (bright illumination). Early LEDs emitted red light with low intensity but as the technology progressed, they offered many different colors of light with high intensity. For example red, blue, green yellow and orange.
A LED ring light combines the Light Emitting Diode idea with the ring idea to form a very useful illumination tool. This kind of light is greatly used in Macro photography, microscope, torch, indicator light and plant grow lighting. For example in the Macro photography the object of the shot has a larger size in the picture than its size in real will create a clarity problem. A distributed illumination makes a big difference in solving this problem. Another example is replacement of the indicator light in so many devices like TVs and radios.
The advantages of using LEDs over ordinary lights are enormous, for instant lower energy consumption, better robustness, longer life time, cheaper cost and faster switching. For example, a business that grows plants indoor or in green houses uses a lot of electricity to power its grow lights, using LED Lights will save up to 40% or more in the energy bill. They come in different sizes and shapes that used in many ways. This light could be powered by many sources and some of them use USB source, like the USB LED. Switching to LED Ring Lights is a very smart design especially if the project depends on lower cost, more efficiency and longer life time.