​This tube light series of LED T8 lamps replace conventional fluorescent lamps in existing fixtures and are all dual-ended bypass, which means they are hot on both ends. They offer significant energy-efficiency and lifetime improvements over fluorescent lamps, and require bypassing the existing fluorescent ballasts, and hard-wiring tombstone lamp-holders directly to incoming AC power leads. Dual-ended bypass lamps eliminate the need to replace shunted tombstone lamp holders in existing fluorescent fixtures.