@marshray
It looks like Romex coming in from the left, then down through the shelf ( to the transformer?), and next to that a black and blue (I believe brown and blue are used in Europe as opposed to Black and white used here in the US) comming back up thru the shelf (from the transformer) to distribution connectors, then out to the lights.
The blue wires don't look to be any part of the circuit at all. They're taped to some (differently?) marked white wires then out of view to the left.
It could be that the picture is about the blue wires thru the wall, the others wires just happen to be the pre-existing LED light hook-up that happen to be in the picture as thats where they were?
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