The Power-GLO T8, 15 W linear fluorescent aquarium bulb delivers a super bright, bluish white light with a high-colour temperature (18000K). The bulb is great for simulating open water lighting conditions as well as for providing a beneficial spectrum for a variety of freshwater and marine aquariums. The super bright light has a strong blue spectral range that intensifies fish and coral colours. It is ideal for supporting photosynthetic corals, invertebrates and other marine life as well as for marine and African cichlid aquariums. The normal output bulb fits all suitable standard and electronic ballasts. Size: 46 cm (18 in).