Dimmable LED panel Campo for URail 1-phase rail system The LED panel Campo is a modern component for the URail 1-phase rail system (230 high-voltage rail system). It produces a flat and glare-free light and is ideal for use in the hallway. The warm white light emitted by the panel can be adjusted in brightness with the help of many different dimmers. The pure white look allows Campo to harmonize with numerous interior styles.