Gradus CLC13/LB20 is a two-piece, PVC-u flooring profile designed to house the Gradus LED floor loom or Interlok Advance LED lighting system for walkway and aisle illumination. The Continuity LED lighting system can also be housed in this profile when used with the clear top, up to a maximum of 10 metres per single run. It has a 12mm gauge in order to accommodate thicker gauge carpets or traditional carpets with underlay. The base is fitted to the floor first to house the LED floor loom, then the top is clipped into place. The top is co-extruded with a clear or smoked window so that light can shine through. When fitted, the compressed thickness of the carpet should always be a tight fit to the internal gauge of the combined top/base profile.