Case study: Biblioteca Daniel de Sá Welcome to Portugal’s most efficient library Portugal’s most efficient library was inaugurated at the end of 2014: The Daniel de Sá municipal library in Ribeira de Grande, on São Miguel Island in the Azores. The new LED lighting is controlled by the Excellum2 light control system. The new library is situated in the old Casa de Natividade, a building listed as municipal heritage, but that had been vacant

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