A wooden floor is a natural product, and will always discolour a bit. This mainly occurs due to UV light. The process is very slow. For example, you certainly will not notice discolouration in the first month following installation. In addition, your furniture, wall coverings and upholstery will also be affected by the sunlight. As a result, you will not experience serious discolouration of the wood. However, if you pull away a rug for example, you will see a difference.