Lights in Showers
I see a lot of showers with lights in them. Great if they are done right, but done wrong and you are looking at mixing water and electricity.
A recessed light in a wet environment has to be rated for that area. Got to your local home supply store (Home Depot, Lowes, etc.) and look at the recessed lights. The ones for the shower all have a lens between the bulb and the shower to prevent splashes from hitting the hot bulb. One drop of water on a hot bulb and it can explode, scattering glass all over the shower.
National Electric Code says if the fixture is above the tub or shower, and within 8 ft. vertically from the top of the bathtub rim or shower threshold, the fixture must be rated for damp locations. Most ceilings are 8 feet high, with showers often having drop ceilings.
If the fixture may be subject to shower spray, it has to be rated for wet locations. These are the fixtures that look like they belong in a submarine or the pool.