Hello.
Red light penetrates deeper into the skin than blue light. As far as penetration depth is concerned it is a tricky question as it depends on how you estimate such a penetration: light power, sensitivity of the sensor you use to measure backscattered light, etc. Usually it is said that blue does not penetrate further then the epidermis but is you speak of thick (feet, hands) and dark skin (phototype V or VI) red light might not penetrate much deeper than the epidermis either...so !! I don't know if such a piece of information matches your expectations but if you can norrow down the scope of your question (spectral range, type of skin) I might (not sure!) be able to answer more precisely to such a question...at least I can try.
Kind regards,
Marine.
Hi. The answer you can find in paper: http://www.imp.gda.pl/implaser/nasze_wyklady/fizyczne_podstawy/med_main.htm . You have there exact dependence of penetration depth versus laser type i.e. its light colour (Rys. 7 i.e. Fig. 7). The trouble is that whole paper is written in polish however you can use Google transtator for rough translation. All the best.
The differences are quite significant with red ligth penetrating 5 to 10 mm, while blue light only penetrates few mm. That is the reason for using red light in photodynamic therapy, albeit the fact that blue light is a potent activator of the photosensitizer.
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