Coralife 5522, 24 Watts, Compact Fluorescent Replacement Lamp, 13 Inches, 10,000K Daylight 13 inch long, 24 watt replacement aquarium lamp with straight pin base An excellent choice for both saltwater and freshwater tropical aquariums Compatible with Coralife and other manufacturer compact fluorescent light fixtures A higher intensity light source than traditional T8 lamps, compact fluorescent lamps have been used in aquarium light fixtures for several years 10,000K Daylight lamps cast sparkling bright white rays and provide high lumen output to simulate the midday tropical sun