PDT-3H  Photodynamic Therapy (PDT)--LED system. --- Latest skin rejuvenation technology
PDT-- LED technology using the high purity of the light and act on the skin tissue securely, increasing skin elasticity and rejuvenation.
LED is under apyrexia domino effect, effectively killed Propionibacterium acnes, eliminate dermal patches, freckles and chloasma.
LED is originated from the United States Department of Space Research. Researchers observed how to use the different optical radiation to affect cell activities, and stimulate a specifically metabolism, similar to plantphotosynthesis whereby plants use chlorophyll to convert sunlight into cellular building blocks. 

 research has yielded positive results, including :
Reduction in metabolic bone collagen that made the disintegration of the yeast : Matrix ,Metallo-proteinases, MMP-1 and MMP-
2. At the micro level to stimulate the mitochondria inside cells (Mitochondria) to generate more energy sources Adenosine Tri-phosphates (ATPs)
3. Apart from ossein and elastic fibers, optical radiation on the other organizations entire dermis also have a positive impact
Scientists have different names with PDT--LED skin rejuvenation :photo-modulation, photo-regulation or photo-bio-stimulation            ,