Street and outdoor lightingOutdoor lighting is needed so that streets and roads are safe for both pedestrians and vehicles. Lighting also enables hobby activities and competitions in sports facilities during dark seasons of the year. With careful planning and lighting control the quality of lighting in urban areas can be improved in such a way that the desired level of lighting is achieved with as little energy consumption as possible.
The light production or, in other words, light flux of lights used in outdoor lighting tends to reduce as they age. This is particularly visible in the mercury lights common in outdoor lighting. Despite the reduced light production, the electricity consumption of the lights does not fall. Lights should be changed at regular intervals in accordance with the maintenance plan, even before they are broken.
Outdoor lighting maintenance should also include the monitoring of burn times and ensuring that the dusk switch is not covered in dirt, in which case it will interpret the surroundings to be darker than they are. As little as 10 “unnecessary” minutes in the mornings and evenings comes to more than two hours a week, and corresponds to an additional cost of about €50 per street kilometre a year.