The energy consumption rate around the world is increasing. A large amount of energy is consumed for lighting purposes. The lighting system is accounted for approximately 19% of total energy consumption. So, development is needed in the lighting system to save energy. This paper represents an energy-saving smart lighting system for commercial buildings. This is a user-friendly system based on Arduino Nano and NodeMCU. This system can be easily controlled by Wi-Fi module. Here, node MCU works as Wi-Fi Module chip. It is low cost and can be configured to connect to the Internet for Internet of Things (IoT). Experimental results show that energy can be saved because it consumes less power than the normal lighting system. The day-light sensor provides the system more accurate. A light dimming property is performed with the help of a daylight sensor. We have scheduled running office time for enlightened the working place of a building as well. The proposed system has both automatic and personal control system.