T5 - T8 LINEAR LAMPS (TCP Brand) - Smaller cost, bigger energy savings. Our line of T8 and T5 Fluorescent High Bay Luminaries provide both for your industrial or commercial facility. An energy-efficient alternative to HID systems, our linear line will reduce lighting energy costs by as much as 50 percent. Plus, the “stay light” feature doesn’t leave you in the dark. If one lamp goes out, the rest stay lit. We’re also putting you in control of your lighting with instant start electronic ballasts– allowing multiple lamps to operate with one ballast.