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Q: What is special about a red laser or LED? Why can't sunlight do the same things?
A: Sunlight contains ultraviolet-B and ultraviolet-A radiation, visible light, and infrared radiation. Different wavelengths can have a different biological effects; some effects are positive and some effects are negative. Red light can penetrate deep into tissues (the longer the wavelength, the deeper the penetration) and specifically targets a light-absorbing chromophore in the mitochondria.
- Dr. Joan Roberts, Professor of Chemistry and Chair, Department of Natural Sciences, Fordham University
We welcome your questions and comments! Please direct these to the LLLT webmaster: Dr Linda Jones.