JBL Solar Marin Blue facilitates coral growth through enhancing the blue range in the spectrum that is preferred by zooxanthellae (so-called actinic radiation). When used in combination with JBL Solar Marin Day it is the ideal lighting for marine aquariums. Suitable for use as night lighting to observe night-active fish in freshwater aquarium. Service life of 10,000 hours.18 W - Length: 60 cm, Diameter: 26 mm25 W - Length: 75 cm, Diameter: 26 mm30 W - Length: 90 cm, Diameter: 26 mm36 W - Length: 120 cm, Diameter: 26 mm38 W - Length: 105 cm, Diameter: 26 mm85 W - Length: 150 cm, Diameter: 26 mm