Introduction
The smart street light control system is based on a wireless mesh technology. Smart controllers, capable of network and device-related decision-making, are installed in each of the new 312 LED street lights in Tartu and rely on wireless communication for exchanging information between the controllers and sensors.

This smart control solution requires no permanent server connectivity as operational rules are stored directly in the luminaire controller. The aim is to bring intelligence and data processing to the device level and build networks of locally collaborating self-aware devices – sensors and luminaire controllers – which take into account local weather and traffic conditions and adjust street lights without any central server data processing. 

The smart controller system is expected to result in up to 80% energy savings when combined with LED luminaires, up to 70% savings from maintenance costs, significantly lower carbon emissions, much less light pollution and longer luminaire lifetime. The citizens will also be engaged through the CIOP in form of a poll that explores the outdoor lighting comfort level. Based on the feedback received from the residents, the brightness level of the street lights will be adjusted.