Application of High Brightness LEDs in the Human Tissue and Its Therapeutic Response

The peculiarities of the light emitting diode, such as low power consumption, extremely long life, low cost and absolutely secure irradiation power is a attracting many researchers and users. With the advancement and the emergence of new applications of LEDs on health manufacturers of these solid-state devices, they have improved in all parameters of interest to its applicability as the evolution of performance in the maintenance of lumen (photometric unit), several categories of power, availability and reliability of the color spectrum and wavelength. The high intensity LEDs plays an important role in therapeutic application, aggregating the technology of solid-state devices and a variety of electronic converters that supplying these long-lifetime devices for controlling the output current, output power, duty cycle and other parameters that directly interfere in luminous efficiency in the wavelength and the response of treatments applied to human health. In skin, the red light has restorative action, healing and analgesic, while blue has bactericidal action. The intensity of the beams of light emitted by LEDs on the skin is lower, since its cells maintain a good interaction with the light (Elder, D. et al., 2001). In addition to speeding up the cell multiplication, the light beam favorably act in the recovery of the skin affected by acne. A major advantage of LEDs is the emission of light in a broad spectrum, from ultraviolet to the near infrared. Bearing in mind the important issues referred above, this work describes a wide study of the state of the art on this topic in concert with proposals of driver topologies and preliminary results based on ongoing experiments. The study has been motivated by the important benefits already mentioned and need of improvement of the driver topologies in this prominent field of study.