This unit covers approximately 3 feet of tank but only measures 4 3/8 inches in length!!! It is extremely versatile and cost effective! Our Moonlight tube is designed to produce a 120 by 60 degree illumination by utilizing extremely bright ultra blue LEDS. Installation is a breeze.... simply use the included brackets and double sided tape to mount the unit then angle the moonlight as you desire. Our Extreme Moonlight is also available in a dual package for Larger tanks. Specifications: * LED Tube with 5 Wide Angled Ultra Bright LEDs * Safe Low voltage 12v DC Power Supply * 8 Foot Cable with On/Off Switch for Easy Manipulation * 2 Easy to install Brackets with Double sided Mounting Tape * Ultra Long LED Lifespan!