Metal Halide bulb (See Option to Upgrade your Metal Halide to a higher Kelvin (Whiter & Bluer). For tank height 18" to 36" use MH 175W / 24" to 36" use MH 250W / 24" to 60" use MH 400W), 2 - 24" Super Actinic Blue 75W Very High Output Fluorescent Bulbs, 2 - 4" fans, light enhancing spider light metal halide bulb reflector, Black Aluminum canopy. Dawn to dusk effect - one control for the metal halide and one control for the fluorescents. INCLUDES HAMILTON ELECTRONIC BALLAST UPGRADE FOR VHO BULBS.