Often light fittings, audio/video and HVAC systems are all competing for limited fixing points in a space, for example the location of ground recessed light fittings may need to be carefully worked through vs air vents in the floor. Detailed early design discussions will enable better solutions.
Pools and spas are unforgiving environments for light fittings. If water can find its way in, it will and a chlorine or saltwater environment may degrade finishes and seals. Using appropriate really high quality light fittings, with water ingress points of failure designed out, will reap rewards in the long term.