For single-ended direct-wired LEDs, line and neutral are connected to the lampholders at one end of the fixture. If shunted lampholders are used in the fixture, they must be replaced with non-shunted at one end of the fixture. Connecting line and neutral to a shunted lampholder will cause a short circuit (line and neutral are shorted together). Tubes of this type can not be reversed in a fixture. A fixture modification label (should be supplied with the tube) is affixed to the fixture showing which end has power.
4 Lamp Parallel Ballast
LED Single-ended Wiring Diagrams
Using existing light fixture wiring
Lampholders on left side were replaced with non-shunted lampholders. Lampholders on the right have the original shunted lampholders.
Using new 18 AWG light fixture wiring and non-shunted lampholders