It is well known that LED therapy using light energy in the blue light range of the electro-magnetic spectrum (400 nanometersto 500 nanometers) is very effective in treating mild to moderate acne vulgaris.When P.acnes bacteria is exposed to blue light energy, a photo-toxic event is created, resulting in the death of the bacteria.Specifically, LED systems utilizes the mechanism of endogenous photodynamic therapy where bacterial porphyrins,…