4 Foot Type D Combo Drive LED T8 Tubes
Why choose between Type A Ballast Compatible and Type B Ballast Bypass when you can have both? Type D LED T8 bulbs work on your existing ballast as well can wire direct once the ballast dies out. This allows for a quicker initial install yet more long-term flexibility with the ability to wire direct to line voltage later on. Some Dual Mode lamps like Keystone's ComboDrive2 and Forest Lighting's UniV8 never have to even re-wire the sockets once the ballast dies, as they are double-end wired just like the fluorescents.