Turn off the lights?

Lighting for safety is not a simple matter

by Mateja Mihinjac

In our SafeGrowth work, we frequently hear calls from local residents for installing better lighting in their neighbourhoods. It is important that the lighting question is carefully thought through and that urban designers know how to introduce alternative solutions to counter the negative effects of reduced lighting on liveability.

Research on natural surveillance and lighting are some of the most frequent research in crime prevention through environmental design (CPTED). Findings show that improved lighting, either through increased illumination or more consistent lighting increases street activity and reduces fear of crime.

It also leads to increased interaction between the residents and consequently to improvements in neighbourhood social cohesion.

Conversely, reduced lighting, especially when coupled with poor ambient lighting, may lead to an increase in some forms of violent crime.

Many pedestrian walkways are not lit at all

Experienced CPTED practitioners will also recognise that some circumstances or places require eliminating or reducing lighting. Context is everything when it comes to lighting. 

For example, it might be better to redirect people with lighting away from a deserted footpath at night to a busier route. Or perhaps it is advisable to shut down lighting at specific hours to limit the operational hours of a public park thus preventing nuisance behaviour. In both cases, lighting controls can reduce the risk of victimization.

Over the past decade due to the expansive introduction of bright LED lamps, there have been frequent calls from environmental agencies for reducing lighting due to light pollution and its effect on the health of animals and humans.

Greg has also examined the impact of illumination on traffic safety and health, and the importance of assessing the context when deciding whether to light or not to light a place.

More recently, the energy crisis has revived the calls for reducing energy consumption and illumination in our cities.

The city skyline looks well-lit from a distance. Close up, it is not always the case!

THE EUROPEAN ENERGY CRISIS

Europe, especially, has been dramatically affected by the now 9-month war in Ukraine. To help counteract soaring energy prices this winter, the European Commission called for mandatory energy savings by EU countries that need to reduce “electricity consumption by 5% for at least 10% of high demand hours each week”.

As a result, some European cities have reduced the illumination of landmarks, shops, and monuments, decreased illumination levels, or completely switched off or reduced the duration of public lighting.

Slovenia is no exception. Lighting has already been turned off on some motorways and highways where it is legally allowed to do so despite concerns that it might negatively affect traffic safety.

Yellow/orange sodium lighting on a walkway

The mayors of some cities have instructed lights to be switched off before dawn, while in other municipalities promotional digital screens will also be turned off. Some cities decided not to light their downtowns this festive season or will limit festive lights to reduced operational schedules.

IMPACT ON SAFETY?

While the current energy crisis, environmental and health concerns speak in favour of reduced illumination it is uncertain what and if any effects this might have on neighbourhood safety. Many European cities are already poorly illuminated compared to some North American, Australian, or large European cities. 

What is "appropriate" for lighting depends on the context

This is in spite of research that shows poor ambient lighting (that will now replace adequate illumination of some streets) might actually increase safety concerns. Moreover, appropriate lighting is important for improving perceived safety and interaction, especially during wintertime when the sun sets by late afternoon. 

High-quality lighting is the cornerstone of safe design in public places at night. Effective crime prevention means that practitioners and residents must know the proven lighting methods that contribute to safe urban places.