Abstract: An electrical power generating water jet for a spa, pool, or the like, having a stationary housing as a stator and at least one water jet as a rotor for generating electrical power when a pressurized fluid imparts movement of the jet relative to the stationary housing so as to generate an electrical charge during rotation of the jet to power an electrical circuit, such as a light source or an acoustic device. The electrical circuit may be carried in a user replaceable module, so as to change a defective light source, or to vary the display pattern or colors of the light source.