1 - Metal Halide bulb (See Option to Upgrade your Metal Halide and ballast to a higher Kelvin (Whiter & Bluer) and/or higher wattage (Brighter). For tank height 18" to 36" use MH 175W / 24" to 36" use MH 250W / 24" to 60" use MH 400W), 2 - 55W Super Actinic Blue German Compact Fluorescent bulbs, 2 - 4" quiet fans, Black Aluminum Canopy, High Quality electro-white reflector. Dimensions: L24"xW11.5"xH6.5"