French shoppers have become the first to experience a new LED lighting system that sends special offers and location data to their smartphones.
The technology was designed by Philips and has been installed at a Carrefour supermarket in Lille.
It transmits codes via light waves, which are undetectable to the eye but can be picked up by a phone camera.
The innovation offers an alternative to Bluetooth-based "beacons", which are being installed by many retailers.
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