How to bypass ballast for T8 4ft LED tube?
Not a problem if 1 or 2 fixtures , there 2 kinds of ballast bypass lamps single end or double end first we need to know the type, I prefer double ended because then all existing tomb stones can be used. First if this is a double ended lamp I would tie the center. Or middle tombstones to the hot or neutral it doesn't matter then the outside one at each end to the other tombstones. 
If this is a single end led the tombstones can not be shunted, but if the tombstones are not shunted (the 2 contacts read open with a contunitity test) I would wire the center or middle toombstones hot on 1 side and neutral to the other of each of the center tombstones. These are the only connection options (other than if you wanted to waste wire and put them at the outside ends). Make sure to label the fixture and if single end the hot &amp; neutral end. This will work with 1 or more lamps end to end.