What is one of the main effects produced by ultraviolet light?

One of the main effects produced by ultraviolet light is indeed the production of heat. When ultraviolet light interacts with the skin or other materials, it generates energy in the form of heat due to the absorption of light energy. This heat can increase local blood circulation and may help in the healing process of tissues. Thus, UV light is often utilized in applications for its ability to promote skin health, indirectly through this heating effect.

In the context of skin treatment, it's important to note that while it produces heat, ultraviolet light also serves additional functions, but the primary effect being discussed in this question is the generation of heat.