The lighting is obtained from the phosphorescence technique that makes the pool appears glowing in the dark of night. This unique eco-friendly phosphorescent swimming pool designed by Atmosphere Piscines (www.atmosphere-piscines.com) using a phosphorescent coating or gel coat to cover the basin’s surface. This material is capable of storing the exposure of sunlight energy and release it during the night, thus it giving the phosphorescent lighting effect. Phosphorescence glow is bright enough, so that swimming at night can still be done without outdoor lighting fixtures. That is so amazing!