When using different spot sizes for laser treatment, which spot size should be used for thinner or smaller hairs?

Using a smaller spot size for laser treatment on thinner or smaller hairs is advantageous because it allows for more precise targeting of the hair follicle. Thinner hairs require a concentrated energy delivery to effectively damage the follicle without affecting the surrounding skin. A smaller spot size can also improve the effectiveness of the treatment by ensuring that the energy is focused on the hair shaft and follicle, leading to better hair reduction results.

Conversely, larger spot sizes are more suited for thicker, darker hairs, as they cover more area and can deliver energy to a larger number of follicles simultaneously. Average and no specific sizes do not provide the precision and effectiveness needed for the treatment of fine or thin hair, making them less effective options for achieving desired treatment outcomes.