RED Light 

Stimulation with intense Red (630nm-650nm) light lead to

Tissue repair & Regeneration. Stimulation with red light causes

The release of cytokines in the skin which stimulate fibroblast

Proliferation & the production of  growth factors, thus influencing

The inflammatory process & leading to disappearance of the acne.

  BLUE Light    

 The bacterial infection causes inflamation which is what

We see as acne. P. Acnes bacteria contain porphyrins , which

Can be excited by Blue(420nm-470nm) light.

When the porphyrins are exited by the intense blue light, they

Become converted to chemical which is deadly to the P.Acnes

Bacteria. This leads to the deat of the Bacteria.