CL5-54 Size: 46" Features: -Bulbs.-Must be installed in hoods manufactured for T5 HO lamps.-Does not work in a regular T8 or T12 type fixture but provides more light output than T8.-Promotes the growth of zooxanthellae algae, essential for growth.-Well being of live corals and invertebrates.-Distributes light evenly across the water surface.-Generates less heat as compared to metal halide lamps.-High quality lamp. Options: -Available in 22'', 34'' and 46'' sizes. Dimensions: -22'' Dimensions: 23.5'' H x 2'' W x 0.88'' D.-34'' Dimensions: 35.75'' H x 2.25'' W x 1.25'' D.-46'' Dimensions: 47'' H x 2'' W x 0.88'' D.