Save it Easy adaptors are the quick and simple way to convert existing T8 fittings into T5 high efficiency fittings - without having to change the who fitting. These adaptors also convert switch start fittings to high frequency operation, with a high frequency ballast incorporated into one end of the adaptor. These adaptors enable users to enjoy the benefits of T5 lamps - energy saving without compromising on light quality, and longer lamp life. This product comes with the adaptors and bridging piece to convert FOUR T8 lamps.