Elite LED Tube Lights easily retrofit into your existing T8/T5 fluorescent tube fixture; giving you better quality and longer lasting light. LED lights can last up to 10 times as long as standard fluorescent tubes; use less wattage and are more efficient at directing light down into your aquarium. Great for fresh or salt water; the 24 in. model comes with 20 LEDs; with an output of 4 watts and 400 lumens. The non-electrical end prongs of the LED fixture easily fit into the existing slots for fluorescent tubes to secure in place. Required single and triple tube transformers are sold separately. For complete product information; download the instruction manual. For more information on LED lighting; please read our article on LED Aquarium Lighting Basics.