- Aug 16, 2007
There is no exact line between what wavelength is carcinogenic and what one isnt - the intensity and duration of exposure are also factors there. If given the choice it'd rather be bombarded with 1 uW/cm2 of 390 than 1 watt/cm2 of 405, or even 445 for that matter.As far as I know, 445nm is not a short enough wavelength to be carcinogenic.
That is not to say that it is impossible for it to cause melanoma.
IIRC, the wavelength must be <390nm for it to be considered potentially carcinogenic. You will have a hard time giving anybody cancer even with a 405nm laser.
Exposing your skin to intense laser light is not a good idea regardless of the wavelength.
The result is obviously a thermal burn and pain. It's a no-brainer.
One thing to consider is just avoiding the risks here - don't experiment on yourself. It's not likely, but you'll never forgive yourself if in a few decades a melanoma develops on that hand, and spreads in no time throughout your body. Malignent melanoma's are about the worst kind of cancer one can have - while easily removed, they metasthesize at alarming rates, and often proof fatal regardless of removing the initial melanoma or not.