The power cable is fed through a small pin on the ceiling suspension of the light. To shorten the cable, simply push it in. If you want to lengthen the cable, push the pin in with one finger while pulling the suspension wire with the other hand. There is also another mechanism on the lamp body that allows you to fine-tune the hanging depth by loosening the screw slightly. Thanks to this mechanism, you can change the hanging height even after the lamp has been mounted.