Originally Posted by FricFrac

Impresive. So you either have the ability to change the light source wavelength to one that the flaw will defract or reflect the light or change the flaw so that it defracts or reflects the wavelength of light you have available..... Sorry but that's just defying physics...

I think what you meant to say is you have excellent eye sight and with a broad spectrum light source you can easily detect flaws in paint and clearcoat.

Broad band gives you the majority of wavelengths to reflect or refract. Narrow band will help eliminate reflections and refractions of items of no interest (eg non-flaws) and help highlight flaws. That's why multiple various light sources are helpful.