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A French grocery chain is turning its overhead lighting into a way to send special offers directly to shopper's phones. It's seen as a way to experiment with technology, while still serving a more basic function. The lights are created by Philips ... and are being tried at a Lille branch of Carrefour, one of France's major chains of food and home goods stores. The entire store has been refitted with LED bulbs. Unlike ordinary bulbs, these transmit a signal by emitting light at a specific frequency for each bulb. The light can't be seen by the human eye; however, the front-facing ... (view more)