Phototherapy lamps are used in light therapies for treatment of biological tissues, such as skin tissues, by ultraviolet (UV) radiation of an affected area. Phototherapy is a medical technique which utilizes lasers, LEDs (light emitting diodes), or other light sources to stimulate or inhibit cellular function. Phototherapy involves exposure to specific wavelengths of light for a prescribed length of time to both treat disease and affect cosmetic enhancements to the skin. Science throughout the years has identified the effects of various wavelengths of light. The use of phototherapy lamps in medical science and aesthetics is aggressively growing as more and more wavelengths of light are being discovered to target many different sections of cells with a purpose to stimulate cellular proficiency and enhance the body's capacity to heal and rejuvenate itself. For example, a therapeutic procedure for the treatment of vitiligo is represented by psoralens therapy combined with ultraviolet irradiation limited to the UV-A range, generally known as PUVA therapy or PUVA-therapy. Psoriasis has been treated with ultraviolet-B (UV-B) light with wavelengths ranging from 290-320 nm. Phototherapy is presently employed to treat acne, wrinkles, sun and age spots, neonatal jaundice, rosacia, eczema, skin psoriasis, and wound healing through wavelengths indicated by various colors (i.e., wavelengths) of the light spectrum. Through the use of various wavelengths, colors relatively close on the spectrum can cause varied effects when ascribed to different parts on the body. The phototherapy light source is commonly provided by a pad with a cluster of LEDs or a probe with LEDs and/or lasers or other light source. The effectiveness of phototherapy is affected by a variety of factors determined by the properties of the light source, e.g. wavelength, energy fluence (dose), power density, pulsing parameters, and also by the physical characteristics of the patients.
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