Adding a power switch to your wall lights allows you to conveniently turn them on and off without having to fumble with a plug or rely on a pull chain. This can be especially useful in hard-to-reach areas or if you want to create a more sophisticated lighting scheme.
There are many different ways to add a power switch to your wall lights, depending on the type of light and the existing wiring. If you are not comfortable working with electricity, it is best to hire a qualified electrician to do the job.