Computer hardware research and development; Computer technology development, technical services; Solar photovoltaic power supply system research, development, design; Engineering and technology research and experimental development; Information electronics technology services; Power electronics technology services; City and road lighting engineering services; Lighting system installation; Lighting engineering design services; Highway lighting system design, installation, maintenance; Lighting lighting design services; Lighting, decorative items wholesale; Daily lamps and lanterns retail; Lamps and lanterns retail; Computer power supply repair; Switching power supply repair; Uninterruptible power supply sales; Optoelectronic devices and other electronic devices manufacturing; Lamp electrical accessories and other lighting apparatus manufacturing; Uninterruptible power supply repair; Passive devices, active communication equipment, trunk amplifiers, optical communication devices, optical modules sales; Photovoltaic equipment and components sales; Photovoltaic inverter sales; Lighting equipment leasing; Machinery parts wholesale; Machinery parts retail; Machinery technology development services; Machinery technology promotion services; Machinery technology transfer services; Machinery technology consulting, exchange services; Software development; Information technology consulting services; Intelligent machine system technology services;