Connecting our energies

Home > News



Citéos provides innovative public lighting for Chartres
2011-08-12 : Citéos provides innovative public lighting for Chartres
Citéos, a partner of the City of Chartres since 2004, has implemented innovative solutions to enhance the city's heritage sites while providing quality service to local residents and optimizing energy consumption.

”Chartres in Lights” has become one of the City’s major events, during which residents and tourists rediscover the city’s heritage together.


Innovation: Double function lamps

Citéos provides the lighting for more than 27 important monuments and sites every day, from night fall until 1 o’clock in the morning and from May to September. The public lighting must be discreet to avoid disturbing the lighting of the sites during this period.

In the past, the standard lamps were replaced for the five months of the event with low-luminosity incandescent lamps.  The operation was complicated and expensive. After a year of research in partnership with the manufacturer Comatelec, Citéos suggested to the City an adaptation of the Maya lantern, to be installed in the city center. It has a double function so that it can be used as a 100W light source (in normal situations) or a 20W source (for special events).
Thirteen light fixtures of this type were installed successfully, so Chartres then wanted to extend the system to allow for energy savings: the 20W sources are now used throughout the year, from midnight until 6 o’clock in the morning.


Customized lighting management

A remote radio management system was installed in order to automatically switch over from one lamp to the other.
With this remote management system it is also possible to remotely control all of the public lighting facilities and to finely optimize them to provide better service quality.
Based on the state of the networks, two systems were chosen for Chartres:
• For the old networks, radio technology was selected. The system can monitor the state of the lights and save energy by adapting the luminosity depending on the time period.

• For the new networks, a set of lighting regulators was installed to control each light fixture individually through Power Line Communications (PLC).