The bio-stimulating effects of low level narrow band light have aroused much interest since the pioneering work of Master in the early 1970's and were proven in clinical and in vitro studies. However, it has been shown that at least some of these biological effects can be achieved by exposure to non-coherent low-level red light. In fact, macrophages exposed to 630 nm low-level wavelengths release factors, which stimulate fibroblast proliferation and mediators of wound repair and inflammatory process healing.

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