The GLO T8, 20 W Single-Bulb Conventional Ballast Fluorescent Lighting System provides flexible lighting solutions for aquarium cabinets, multiple aquarium setups on store racking, shop set-ups and custom installations.This convenient, practical, well-equipped lighting system includes everything you need to make your installation simple and adaptable to most applications:- Easy-mount ballast housing- Ample wiring to allow rear cabinet mounting- Water resistant end caps, allowing placement of bulbs close to water surface- On/Off switch- Replaceable starterThe lighting system is easy to install: simply mount the ballast and bulb clip holders to a solid surface and attach the water resistant bulb end caps to the bulb and you are ready to light up your aquarium installation. Bulb size: 61 cm (24 in) Other models available:- A1567 GLO Single-Unit Conventional Ballast Lighting System, T8/T10/T12, 1 x 30 W- A1570 GLO Single-Unit Conventional Ballast Lighting System, T8/T10/T12, 1 x 40 W