Energy-efficient, linear fluorescent lamps are the heart of a cost-effective lighting system for new commercial construction or an energy-saving, cost-saving lighting upgrade. These T-8 fluorescent tubes (F32T8 / 741) with medium bi pins are 4' in length & offer 2710 lumens & at least 20,000 hours of lamp life. As part of the Eco-Line, 32-watt lamps are low-mercury TCLP-compliant lamps that can be disposed of as nonhazardous waste in most states, reducing disposal costs.