- n° 211103
"There are technical solutions for reducing lighting bills: high-performance bulbs, electronic ballast, automated management etc. But above all, local authorities need to define their lighting policy. "Lower taxes, but ever-better street lighting." Taxpayers' wishes are contradictory, but not necessarily impossible to fulfil. It is indeed possible to reduce lighting bills without reducing comfort levels. "A good many problems are solved by using efficient equipment, setting standard light levels, and switching off lights when they are not necessary," sums up M. Irigoin, at Montpellier city council. However, "managing electricity, both outdoors and indoors, requires analysis. You have to devise a lighting plan, and only then decide what technical means are needed to achieve it," says D. Ouvrard of the Syndicat de l'Eclairage. Montpellier has been committed to energy management for many years. "We created an energy department as long ago as 1985. By analysing our energy expenditure, we found that two-thirds of it was for electricity," he says. The city's electricity bill fell from 1.4 million euros in 1986 to 1.33 million in 2002, despite an increase of 30% in the area covered. "Our service is responsible for all aspects of energy supply, from initial design to maintenance and paying the bills. So we have a global view of the costs, and we can see the results of our actions," says M. Irigoin. And indeed, costs are the key. "What do we want exactly: financial savings, or energy savings? Saving energy isn't necessarily cost-effective, because investments can take a long time to write off. But they are still desirable: it's a matter of acting for the public good, and local authorities should set a good example," says P. Saclay, of Nantes city council. Technical solutions are well-known, with the primary one being the replacement of street lamps with more efficient models. But the lamp itself is not the only factor; the whole of the lighting strategy must be taken into account. For example, a diffusing streetlamp with an oval head directs only 30% of its light towards the ground, and 35% towards the sky, whereas these proportions are 60% and 5% respectively for a lamp head with a reflector. This model also helps to reduce light pollution. Maintenance is crucial. Systematically replacing outdoor lighting every three years results in substantial energy savings. Even if lamps are still working, their intensity is reduced over time, but they still consume as much electricity. And simply cleaning lights regularly results in better lighting. Controlling the amount of time street lamps are lit is also important. "Some cities don't have an efficient system for controlling lighting time, which is 4,100 hours per year on average. Dimmers can save electricity, by reducing the amount of light at certain times of day, specified in consultation with councillors," says P. Hottovis. Outdoor lighting is a sensitive subject, more political than technical. Contact: http://www.syndicat-eclairage.com http://www.afe-eclairage.com.fr/ (Environnement Magazine, France) "
"There are technical solutions for reducing lighting bills: high-performance bulbs, electronic ballast, automated management etc. But above all, local authorities need to define their lighting policy. "Lower taxes, but ever-better street lighting." Taxpayers' wishes are contradictory, but not necessarily impossible to fulfil. It is indeed possible to reduce lighting bills without reducing comfort levels. "A good many problems are solved by using ...
Bâtiment ; Commune / Ville ; Éclairage ; Éclairage public ; France ; Maitrise De l'Énergie - MDE
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