Type D LED PL lamps can bypass the ballast (wire direct) or they can utilize the existing ballast. The options below are designed to work on existing 2-pin Magnetic Ballasts. To see if they are compatible you will need to check out the ballast compatibility sheet on the product pages to confirm it will work on your existing ballast. Remember if they don't work on the ballast, you can bypass the ballast and wire direct to line voltage.