At the DOLL Living Lab, Tridonic is working together with outdoor luminaire manufacturer WE-EF and IoT solutions specialist Paradox Engineering to establish the technical principles for intelligent connected city lighting. An outdoor solution with tunable white functionality is being used there for the first time. The technology enables different lighting scenarios to be selected, such as a pleasantly warm light in the morning. In the course of the morning, pathway lighting can fade up gently to a comfortable level and gently dim again if no movement is detected or if sufficient daylight is available. The colour temperature can continue to adjust throughout the day, slowly changing to energising light with a cool colour temperature. Traffic flow can be measured using sensors in the street lights and this information can be linked to the traffic light control system to reduce congestion in the city. Searching for a parking space will no longer be as agonising because sensors in the lights will detect free spaces and this information will be transmitted via the cloud to an app.

The pilot project covers a single-lane approach road to Copenhagen on the outskirts between a commercial area and a residential area. The road is flanked on one side by a pedestrian and cycle path. A total of 23 WE-EF VFL540-SE LED street lights have been installed over a length of around 800 metres. They are equipped with tunable white technology with continuous colour temperature control from 2,700 K to 6,000 K and intelligent Tridonic components. The luminaires have three Zhaga Book 18 interfaces for the sensor and communication modules. Tridonic’s new D4i- and Zhaga-compatible RF Multimaster Controller handles communication between the luminaires. In the initial test phase the interfaces on the underside of the luminaire housings were equipped with PIR sensors. Tridonic has developed these multisensors specifically for street lighting. They have two PIR elements with asymmetric lenses, which enable two separate areas to be detected, as is the case on the DOLL test track. The outdoor drivers developed according to the D4i standard allow the lights to be easily integrated in IoT networks. The system is monitored and controlled by Paradox Engineering’s “PE Smart Urban Network”. Based on standards and open data models, it offers complete interoperability in the management of devices, data and applications.

State of the art with a view to the future

In the first test phase, three use cases were defined and tested, leading to a new, series-ready Tridonic outdoor lighting solution for towns and cities. The “SIDEREA – Citizen Centric Lighting” system solution offers a comprehensive portfolio based on open standards for digital, resource-saving street lighting in the smart city of tomorrow. And that includes such things as asset management for monitoring the luminaires in real time, light on demand for minimising energy consumption and light emissions, and dynamic lighting with adaptive colour temperatures for raising alertness and arousing emotions. Towns and cities have the opportunity to integrate intelligent control into their urban network when upgrading their lighting to LED technology. Or if their budget does not allow for a full upgrade at the time of modernisation they can at least factor that in because the intelligent control components can be retrofitted in any luminaire bearing the D4i seal.

In the current test phase Tridonic is involved in further developing the lighting as part of a digitally connected city. Tests are being carried out to see how traffic-dependent lighting control for motorways could be integrated in an urban network. Integration of traffic lights – as described above – is also planned. Modern sensor technology is used to measure traffic flows and traffic densities and adapt the lighting levels to the current situation. A sensor with an integrated mini camera scans a fixed and defined road situation. However, it does not send the data to the cloud but processes it decentrally at the edge of the network into usable information with no personal data; only then does it pass it on. With traffic flow-dependent dimming, the CO₂ footprint of the street lighting can be further minimised – always with the proviso that safety is not compromised for any road user. And there’s another element with a long-term reach: if the sensors were to operate with a self-learning algorithm they could continue to evolve in processing the incoming data and deliver ever more precise results.

Sustainable street lighting for the smart city

Living Lab for intelligent outdoor lighting

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