Keystone Direct Drive LED tubes eliminate the need for an external driver or ballast. For new construction installations, simply connect the 120-277-Volt line voltage directly to the sockets. For retrofit installations, bypass the existing ballast by cutting the wires and connecting the 120-277-Volt line voltage directly to the sockets. No ballast or driver is required.Replacement for conventional fluorescent lamp50,000+ hour lifetimeApproximately 40% more energy efficient that standard F32T8 lampsEnvironmentally friendly: no mercury usedInstant startupFrosted lens eliminates pixilationImproved lamp durability with shatterproof coated glass