The Penn-Plax Plant Grow LED Light brightens up your aquarium decorations and plants day or night. This fish aquarium decor light is built to offer the ultimate amount of light exposure for your tank. The light measures 4.5 inches wide, by 4.5 inches deep, and is only 0.5 in. thick and stands 6.25 in. above your aquarium when mounted to shine over all your aquarium decorations. Ensure the health and optimal growth of your aquatic plants with this plant growth LED light. with an innovative clapboard hinge, all aquariums, even those with hinged lids, will be able to open and close without having to reposition your light.