Actinic compact fluorescent lamp from ESU. This provides the necessary actinic supplementation to your daylight lamp for saltwater and reef tanks - actinic blue wavelengths are needed by marine organisms because they travel further in the water, and they are used by symbiotic reef algae for photosynthesis vital to proper coral growth.
Power compact bulbs produce more lumens per watt than any other fluorescent bulb. Easy to install, energy efficient, and long-lived. Use with a compact fluorescent fixture or with appropriate ballast.
