Keystone KT-LED15T8-48GC-850-D/G3 third generation, Type B (ballast bypass), 15W, 1930lm, cool white 5000K, 4', T8 Direct Drive LED tubes. Direct Drive eliminates the need for an external driver or ballast. For new construction installations, simply connect the 120-277V line voltage directly to all sockets on a single end of the light fixture. For retrofit installations, bypass the existing ballast by cutting the wires and instead connect the 120-277V line voltage directly to the sockets on a single end of the light fixture. No ballast or driver is required. Must use non-shunted lamp holders. DLC 4.0
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