Normal light : Suppresses excessive light reflection by considering the direction of light to best show the surface's condition. Example) Dryness of scalp/skin, dandruff, wounds, dead skin, etc.
Cross polarized light : Eliminates light reflection from the surface, making it easier to see features without texture. Example) Pigmentation, thread veins, erythema, gray hair, etc.
UV light : ses a wavelength band that is harmless to the human body and allows you to see melanin inside the epidermis as well as on the surface. Example) Sebum (glows white/red), luminescent substances