Alexandrite 755nm: Better for fair/ light and light hair
Skin Types: I II
The wavelength that covers a wide range of hair colors thanks to its power to absorb the energy of the melanic chromophore. Its "superficial" wavelength (the shortest of the three) aims at acting on the Hair Bulge. It is ideal for the widest range of cases associated with hairs, especially fair skin and thin hairs.
Diode 808nm: Better for medium/ tanned and dark hair
Skin Types: III IV
The deep action of its wavelength (therefore on both Hair Bulge and Bulb) has been long used in the hair removal field. Due to its ability of absorbing melanin in a "moderate" manner, it is effective and safe on all skin types.
Nd:Yag 1064nm: Better for dark skin and dark hair
Skin Types: V VI
Thanks to its longer wavelength, it reaches the hair papilla. Its low melanin absorption makes it the ideal instrument for darker and tanned skin.
This color blind wavelength ignores the skins surface colors, only treating the follicle.