Kumho's Earthcare Direct Replacement LED T8 does not require an electrical re-wiring to install. Because it works with popular instant-start ballasts, it is independent of the ballast operating voltage which can be 120VAC, 277VAC or 347VAC. This makes switching to LEDs as simple as changing a light bulb: no rewiring or special handling required. Ease-of-use, and patented design sets it apart from other LED T8s. NOTE: These T8 lamps are designed as direct replacements, to be powered by ballasts in T8 lighting fixtures. They are not.