CPV code 34994100 designates Lighting for river guidance and illumination in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
34994100 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 34994000 (Lighting for ship guidance and illumination).