JBL Solar Marin Day promotes coral growth by increasing the blue fraction of the spectrum, preferred by zooxanthella. Coldwhite spectrum with a colour temperature of 15000 Kelvin and highter luminosity specially designed for lighting marine water aquariums. JBL Solar Marin Day provides corals and other invertebrates with the required light energy for ideal growth. The specially increased fraction of the spectrum from 400-500 nm provides ideal conditions for zooxanthella, essential for the growth of many corals and other invertabrates. Due to the high colour temperature of 15000 Kelvin, combination with blue fluorescent tube JBL Solar Marin blue is mainly superfluous. 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