What is the difference between blue light and red light and which is better for AK?

Can someone who is immune-supressed have blue or red light for AK?

Doctor Answers 1

Depth of penetration of PDT with blue and red light

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Video gives the answers. Red light is used in Australia and the UK. This penetrates deeper than blue, and generally is more painful. Blue light also activates ALA, but penetrates superficially. As skin conditions such as solar keratosis and ak s lie on the surface, both red and blue light PDT are equally as effective. Video goes into the actual wavelengths etc... Dr Davin Lim. Brisbane. Australia. 

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