Aqueon Lamp Max LED Bl 24 Replacement bulb measures 1.25 x 1.25 x 16.5 inches Deep sea illumination that intensifies the fluorescing effect of fish and corals Simply plug and "snap" into place inside the appropriately sized aquarium light fixture Fish tank light retains brightness and color over time while using 70 percent less energy than T8 fluorescent lamps Replacement light bulb fits any Aqueon LED light fixtures, strips or hoods with interchangeable LED lamps