Sylvania DULUX L T5 lamps are high lumen, single-ended twin-tube lamps that provide lumen outputs similar to 2', 3' and 4' linear fluorescent lamps, yet are half the length. with lumen outputs up to 4800 and lamp efficacies up to 87 lumens per watt, these compact lamps can be used in indirect as well as direct applications. QUICKTRONIC® ballasts are available to operate FT18DL, FT24DL, FT36DL, FT40DL/RS and FT55DL lamps. the QUICKSENSE® circuitry in these ballasts provides the end-of-life protection required by NEMA* for these lamps. the quick 60® warranty program applies to DULUX L lamp/ QUICKTRONIC® ballasts installations.