Talk about 395nm and 365nm
The 395nm and 365nm represent in wavelength of uv led strip. The shorter led wavelength , the visual will dim .we makes a test that the light of 395nm and 365nm get into white paper at time, the 395nm more lumen than 365nm on white paper.
Optical speed almost same. So the frequency being inversely proportional to light wave length. The shorter led wavelength has better penetrating power（Photons have no mass， but base on theory of photons , the bigger frequency and the shorter wavelength ,the bigger power）.

Now, makes a example for you refer X-ray is widely used in industrial non-destructive testing and medical perspective inspection because of its strong penetrability.