The introduction of leisure pools with their associated extras, the water slides, wave machines, etc. , requires changes to their lighting design. The factors which now have to be considered when designing the lighting system are many in number; thus greatly increasing the task facing the lighting engineer. He is now not only faced with the task of providing the correct quantity of light over the pool and its surroundings, but he must also provide light of the right quality to achieve the desired effect. The factors affecting the quality of the light are: lighting levels, color of the lights, and the effects of daylight. Various techniques of swimming pool lighting are discussed.