JBL Solar Ultra Natur is a extra bright fluorescent tube for use in fresh and marine water aquaria. The tube produces a full-spectrum light, simulating sunlight, with 9000 K colour temperature. This promotes the growth of higher forms of marine algae and corals. Best possible method of inhibiting algae in freshwater, with full-spectrum light providing ideal conditions for photosythesis. JBL Solra Ultra Natur is also ideal for aquariums in the Japanese style. Best colour reproduction with 1A colour reproduction index (very good) -fish, invertebrates and plants display their full natural beauty.Individual control of lighting climate:-in freshwater combining with JBL Solar Ultra Tropic-in marine water combining with JBL Solar Ultra Marin-16 mm thin diamater-20000 hours lifetime-150% lighting strength, with only 30% more electricity consumption-Please note: these lamps are available in different lenght (also suitable for the Juwel High-Lite lamps), please take care for the right one for yo