Circle LED cable lighting system - a complete set for many rooms Circle is an LED cable lighting system that is supplied as a complete set ready for connection. It consists of a cord, transformer and five circular, flat luminaire heads that can be swivelled on the brackets and positioned in any desired arrangement on the cord, so that even larger or angled rooms can be perfectly illuminated. Das system is suitable for ceiling mounting as well as for mounting on the wall or on a sloping roof. The built-in LEDs produce a warm white light and make the system an energy-efficient light source that can be installed in many rooms and furnishing styles.