All-Glass Aquarium Florescent replacement lamps are the perfect high quality solution for your replacement lamp needs. These energy efficient, T-8 Fluorescent lamps have been engineered to provide an appealing and effective aquarium spectrum light. These lamps highlight the vivid colors of aquatic plants and animals. Item Specifications: Size: 12 inch: 8 watt 15 inch: 14 watt 18 inch: 15 watt 24 inch: 17 watt