GE 22907 - F15T8/AR/FR - 15 Watt T8 Fluorescent Freshwater Aquarium Light Bulb, 18" Length Go to amazon.com Related posts 11 best aquarium light bulb FeatureLength: 18" Width: 1"Average Life Hours: 7500Lumens: 425Color Temperature (Kelvin): 4000KCRI: 92 Description15 watt - 18" - T8 - Medium Bi-Pin (G13) Base - 4,000K - Freshwater Aquarium - Plant / Aquarium / Terrarium | GE Fluorescent Light Bulb