LED tube comes with a constant current source, does not require rectifiers, starter. Generally over T8 led tube because the led tube space enough, the constant current source can be installed on the inside of the led tube. So, when installed, you can remove the original bracket in the rectifier, starter without led tube installed directly up on it.
T5, T4 LED tube does not fit the constant current source because the led tube is small, constant current source can only be mounted in the holder, so manufacturers are doing T4 \ T5 will be configured in the bracket, bracket equipped with a constant current source, and directional led tube installed. Opposite direction, the led tube
is not lit. We are considering adding some conversion circuit, so that even if the led tube is installed anti circumstances, the led tube can work properly.