A lighting system for use with an above-ground swimming pool includes a water access fixture extending through an aperture in the pool wall, for connection with the pool circulation system; and incorporates a sealed light assembly with a translucent cover; secured in depending adjoined, unitary relation with the access fixture. An extended electrical power cord connects with an external power supply and the light assembly, enabling removal of the light assembly from beneath the water, for repair or replacement. A rectifier/transformer 12-volt supply serves the planar array of LED lights, which may be R/G/B and programmed to give a spectrum of coloured lights.