Vitelec recently developed a Wireless Dynamic Lighting Control System for Public Lighting Projects.

This system is able to wirelessly monitor and control public lighting.

Public lighting is the Outdoor lighting that is managed by the government in order to make public life in the dark as safe and liveable as possible. 

The Netherlands contains about 3.8 million Public Lighting points.

The majority of these lights are switched on half an hour after sunset and switched off again half hour before sunrise . On average a street light is witched on for about 10 hours a night, which means some 4000 hours per year.
The dissipated power of a street light varies between 70 and 150 W per spot , depending on position, type and function of the spot. 

In many places the lights burn all night, even though during the night only two 

cars will pass, or streetlights burn all night for an deserted road outside urban areas. In both cases a lot of energy is wasted by keeping the lamps burning at a 100% power rate. 

To save energy, according to guidelines from the Kyoto Treaty, it is possible to dim these lights, or even switch them off completely. 

If a lamp is 50% dimmed between 1 and 5 at night, this cumulates to an energy reduction of 20%. 

It is also more and more possible to switch to LED lighting, which requires far less energy, and less maintenance.

 

The wireless-controlled dynamic public lighting system operates on short RF signals in the 869MHz. Band, which connects the different lights with each other.
Dimming systems that are currently being sold are in many cases based on PowerLine Communications ( a superimposed signal on the 230Vac) this technology, however is not very reliable in a harsh EMC environment. 

The Wireless-Controlled Dynamic Public Lighting  System is shown in Figure 1

This system consists of:
• A Back Office System (BOS) from which the various networks of Public Lighting are being controlled  and  monitored.  If a lamp fails, a message will automatically 

be sent to the BOS, which can automatically generate a work order for the Maintenance Company.
• A Dynamic Master, that functions as a gateway from the BOS to the Network of lamps. The Dynamic Master actually connects the different Technologies to each other.
• The Network Nodes that are positioned in the Luminaires, connect the different lamps of the network to each other.