Description Better Brighter Lamps: Shine 5000 Lumens down onto your plants per 4 ft. tube, all VIVOSUN T5 florescent tubes are HO (High-Output) tubes, which produces far more lumens than standard or HE tubes (4 tubes up to 20,000 Lumens) Dual Switches for Specialized Spectrums: VIVOSUN T5 grow light fixture comes with 2 on/off switches allowing more flexible control over your system Ultra-Reflective Surface Delivers More Light for Less Energy: Low profile, powder coated housing with high-performance reflective aluminum shaped to maximize light intensity and distribution, delivering 95-97% reflectivity and wider coverage Cool, Balanced Light: Premium VIVOSUN T5 lamps emit a balanced blue and violet spectrum at 6500K to promote vibrant vegetation and prevent stretching Long-Lasting: The average recommended usage life is well over 20,000 hours, exceeding the lifespan of almost any HID lamp Date First Available : February 22, 2022 Customer Reviews: 3.3 3.3 out of 5 stars 2 ratings