In this world, everyone is connected, and things become interactive. The eventual fate of the intuitive world relies upon the future Internet of Things (IoT). Smart building is an important aspect of the IoT. During traffic and evacuation, to facilitate the passage of occupants, signage systems are widely used in the built environment. Due to the complex layout of large buildings, rapid evacuation is making way finding difficult. The need for exit signs that take into account when this should be evident, redirecting individuals to not only an exit but rather a practical and optimal way out in an evolving emergency situation has facilitated the improvement of another era of cutting edge signage. Conventional signage cannot adapt to changing conditions because it only conveys single and passive information, and displays static content with limited user interactivity. To address this issue, in this paper, we propose a dynamic active emergency signage system architecture ‘DSS-SL’ based of SDN. We also present a low power LED-based visible lighting communication between smart devices and forwarding switches inside the building.