When lighting a pool or some event around water there are a number of reasons to be cautious. For example, water can conduct electricity so the possibility of shock is a big danger when electricity is introduced. Also when lights get wet they just don’t work unless designed specifically for water. Globes blow, fresnels break, wires arc, etc. The LED color blasters shown below were not too badly damaged when the splash from the high jump pool tried to drown them.
Remember electricity mixes with water about as well as oil.
Hollywood Lighting Partners promotes the Work Smarter Program and knows accidents happen but if you treat your gear right it will perform better with less headaches and people will be safer.