Aquatic Life T5 HO Hybrid 4-Lamp Mounting System Fixture. Available in 24, 36, 48 and 61 lengths for 18-24 wide (front to back) aquariums. Universal mounts included for EcoTech Radion (TM) and AI Hydra & AI Prime (TM) LED Fixtures. This new mounting system with T5 HO lamp housings is for use with the EcoTech Radion and Aqua Illumination Prime LED fixtures, and includes universal mounting brackets to install them into the fixture.