Hagen Glo Twin Starter 2 x20w T8 Electronic Light Aquarium Fish Tank Controller.
The GLO T8, 20 W Double-Bulb Electronic 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, aesthetically-designed lighting system includes everything you need to make your installation simple and adaptable to most applications:
- Electronic ballast technology for low-heat, high-energy efficiency
- Easy-mount ballast housing
- Ample electrical wiring for series placement of bulbs in multiple aquarium rack-type set-ups
- Water resistant end caps
- Adapters and bulb clips for T8 applications
-  On/Off switch
The 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)