Give your coral the natural lighting it needs to thrive with the Zoo Med 50/50 Reef Sun T8 Fluorescent Aquarium Bulb. This combination bulb is designed to provide high-intensity， full-spectrum lighting that’s especially strong in the short-wavelength blue region. It emulates the natural lighting found near coral reefs and supports the growth and well-being of your photosynthetic corals and invertebrates. Each bulb offers up to 10，000 hours of stunning illumination and is great for use with marine aquariums， reef aquariums， African Cichlids and Discus Fish alike.