How To Extend A Pendant Light Cord . And the cables are currently coming through a joist. Light fittings and pendant lights come with chain or cable which may need to be adapted to suit the position in which it is to be hung. 5Pack 15 Feet Extension Hanging Lantern Pendant Light Lamp Cord Cable from www.ebay.com Remove enough links from the chain to shorten the pendant to the desired length. Make a diagram of where all the cores connect. Normally, this is hanging from a junction box on a flat ceiling and the cord is held tight by an inner collet that grips the cord as it hangs straight down.