Direct fit models use the existing ballast, these energy-saving replacement lamps install into linear fluorescent fixtures without any extra labor or rewiring. Bypass models offer additional energy savings and wire directly to the mains voltage. These 23W LED lamps are available to replace 40W 2G11 fluorescent lamps and are available in 3500K and 4000K CCT. The lamp features glass construction and delivers up to 2800 lumens with a wide, 220? beam distribution.