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 ComboDrive X3 can bypass the ballast and be installed via single-end wiring or double-end wiring.

4 Foot Type D Combo Drive LED T8 Tubes

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