Arcadia Ultra Seal controllers are the latest generation of popular fluorescent lighting controllers, incorporating a number of improvements and designed to comply with the latest European aquarium lighting standards. - Easily adds additional T8 lighting to an aquarium. - Patented Ultra Seal waterproof (IP67) Lamp-holders. - Supplied with universal mounting brackets for installation on aquarium hood or walls. - 5 Year Manufacturers Guarantee. - Compatible with Arcadia Reflector range. - Suitable for lamp length - 750mm (30") / 900mm (36") Lamp Diameter - T8 26mm