The market for connected LED or “smart” light bulbs is in its embryonic stage of development, with shipments totaling fewer than 2.5 million units in 2013. However, falling LED prices and the endorsement of ZigBee Light Link as the preferred connectivity solution by a number of leading lighting manufacturers means that annual smart bulb shipments are set to increase to 223 million by 2020, achieving a total installed base of over 400 million.