Which of the following is a light-based method used in photoepilation?

Laser treatments are a light-based method used in photoepilation because they utilize focused beams of light to target and destroy hair follicles while minimizing damage to the surrounding skin. This method relies on the principle of selective photothermolysis, where specific wavelengths of light are absorbed by the pigment in the hair follicles, leading to their destruction. The precision of lasers allows for effective hair removal across a variety of skin types and hair colors, making it a popular choice in aesthetic settings.

In contrast, electrolysis employs a different mechanism, using an electric current to permanently damage hair follicles. Waxing and threading are traditional hair removal techniques that involve physically pulling hair from the root but do not use light-based technology for permanent hair reduction. Thus, laser treatments stand out as the primary method in photoepilation due to their innovative use of light energy for targeted hair removal.