Challenge / Goal
Traditional lampposts consume huge amounts of energy. The aim is to use the most successful techonology(-ies) in the city’s lighting program. Studies show that up to 50 % energy can be saved by optimizing the use of street lighting and this can also reduce the operation and maintenance cost of the public lighting system.
Under the Smart Lighting measure of the Grow Smarter project, the goal is to demonstrate and test three different technologies for smart street lighting: remote, self-controlled and sensor-controlled LED lighting, for pedestrians and cyclists and how these solutions increase traffic safety and perceived security. Another aspect of the investigation is to test different manufacturers, technologies and CMS in the same system, which previously has been difficult due to proprietary issues.
The aim is to identify the best technology which can be scaled up in the city of Stockholm.
In this Use Case, remote controlled LED street lighting is piloted and analysed.
All luminaire are connected to a Central Management System (CMS) where a diming schedule runs.
In the diming schedule, lighting levels are set according to sunset/sunrise and specific times during the night. The lighting is turned on at sunset to 100%, at 10 PM it is dimmed to 67%, at 1 AM it is dimmed to 50%, at 5 AM it dims up to 67% again, at 6 AM 100% and is turned off again at sunrise. Dim steps are equal to changing one lighting class in the road safety standard.
This solution requires a constant power feed, which is not custom for a lighting installation that usually breaks the power supply during daylight hours.
Also, the CMS is communicating with two different technologies; one group of luminaire are connected to a Mesh net while the other group is using power line communication.
control LED Lighting
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City Of Stockhom
Reducing operation costs
Reducing energy bills
Improving energy usage efficiency