Street Lighting in Europe

The 7 Measures to cut off 50% your street light CO2 emissions

Street Lighting in Europe

In a previous post, we saw that it was easy to reduce street lighting energy consumption for almost zero investment. Today, we are going to visit 7 other efficient actions with very good payback time every cities should implement to reduce their electricity consumption.

  1. Redeploy street lighting points: In order to avoid the excessive number of lightings by acting on the spacing and the number of lighting points, these can be redeployed according to their buildings’ architecture and to our street maintenance services. The height of the lampposts can also be optimised to ensure an optimum response to the need for functionality, safety and attractiveness of our territories.
  2. Avoid the over-lighting: Other techniques help avoiding energy waste and limiting luminous nuisances. We can thus avoid lighting from bottom to top, avoid round bowls because they reduce the luminous flow and provoke dazzling sight.
  3. Install passive signal light system: These reflecting signals are effective and don’t consume any energy. Applicable on roads and in rural zones, they reduce the number of lights and reduce thus the need for electricity.
  4. Optimize luminous sources: In the market of lamps, the offer is tremendous. The ones presenting the best results in terms of Energy Efficiency are the following: High Pressure Sodium (HPS), Metal halide lamps, and LEDs. Incandescent bulbs and low pressure mercury bulbs should better be avoided because they need very high powers and heat more than they light up. LEDs, currently under development and improvement, represent one of the key technologies for future. Thanks to them, we are able to save more than 80% of our energy. Here is a good US example. Otherwise, certain lamps emit important quantities of light upward, generating thus losses of energies and a rise of luminous pollution. The directional lights with “Full-cut Off” reflectors don’t emit any light under the horizontal avoiding thus light losses and rising the energy savings.
  5. Renew the ballasts: The most classically used ferromagnetic ballasts are nevertheless not the most effective because they can induce important over consumptions at their end of life. When replacing lightings or installing new lightings, it’s therefore recommended to use electronic ballasts. These generate energy savings while limiting the losses caused by conventional systems. Over voltage control also allows to extend the life length of the lamps. These ballasts also offer the advantage of ensuring the power supply automatic cut when a lamp is defective. Besides, they guarantee the voltage stabilisation and regulation and contribute thus to a better maintenance of the colour temperatures in time.
  6. Install regulation and voltage reduction systems: The voltage regulators – reducers avoid excess voltages, over consumption sources and the defusing of lamps due to voltage drops. They aim at reducing the power during the hours of low use. They also guarantee that the voltage arriving to the lamps is always in the rated range, thus ensuring optimum lighting levels and an extension of the equipments’ lifetime. The reduction of the lighting intensity and the disconnection at night are solutions that generate energy savings up to 1/3 of the electric consumption.
  7. Install remote control and telemonitoring systems: Telemonitoring and remote control systems are wonderful tools to manage the equipments in real time. They allow to control and to monitor every luminous point independently, while transferring the information of every luminous point to a control center that analyses the malfunctions.
With the previous 5 free Energy Efficiency actions, these are the 12 main straightforward solutions an O&M firm or technical city department can use to improve Energy Efficiency on public lighting. However, other solutions are arising, such as exploit renewable energies or install hyper vision systems. Yet, currently under improvement and development, these technologies still face many limits: sound nuisances in the case of wind power lamps, short length of life of the batteries and inverters (around 5 years) for solar lamps, or too few references in hyper vision systems.
Next time, we’ll delve into some practical case studies and, especially, innovative contracts


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