Fluval T5 HO Life Spectrum aquarium bulb delivers a balanced intense natural white light which closely mimics daylight. The bulb is ideal for planted freshwater aquariums and saltwater aquariums. Its high CRI value ensures accurate viewing and present aquarium inhabitants as the way they would in nature. The Fluval T5 HO Life Spectrum bulb provides super bright lighting, strong blue spectral range, stimulates photosynthetic corals, invertebrates and other marine life. The bulb is for use with T5 HO specific electronic ballasts only.