We are in the final stages of planning and the builder has only estimated one LED color light for our 20x40 rectangle pool. I was thinking it would be necessary to have two lights but he said they usually only do two lights for the L-shape pools. Our pool goes from 3.5 ft down to 6ft. I was wondering if anyone had something similar and if they have any advice on number of lights needed. Each light is about $550 so I don't want to spend if I don't need to.