What is used to control street lighting? It may seem like a simple question, but the answer is more complex than you may realize. In this article, we will explore the different types of street lighting controls, their advantages and disadvantages, and how they are used in cities around the world.
**Types of Street Lighting Controls
There are two main types of street lighting controls - manual and automatic. Manual controls involve the use of a physical switch or remote control to turn lights on and off. Automatic controls use sensors and software to adjust lighting levels based on the time of day and other environmental factors.
**Manual Controls
Manual controls are the simplest and most traditional way of controlling street lighting. They are often used in smaller towns or rural areas where there is less traffic and fewer people to monitor the lights. Manual controls consist of a switch or series of switches that can be used to turn lights on and off as needed.
One disadvantage of manual controls is that they require human intervention, which can be time-consuming and expensive. For example, if a light bulb burns out or a power outage occurs, someone must physically go to the switch and turn the lights on or off.
Another disadvantage is that manual controls are not very flexible. Once a switch is in the on or off position, it remains that way until someone manually changes it. This can lead to wasted energy and increased lighting costs if lights are left on unnecessarily.
**Automatic Controls
Automatic controls are becoming increasingly popular in cities around the world due to their energy efficiency and flexibility. There are several different types of automatic controls, including time-based controls, photoelectric controls, and motion sensors.
Time-based controls use a timer to turn lights on and off based on a predetermined schedule. For example, lights may be programmed to turn on at sunset and turn off at sunrise. This type of control is useful for ensuring that lights are only on when needed, but it does not take into account changing weather conditions or seasonal variations in daylight.
Photoelectric controls use a sensor that detects changes in light levels to turn lights on and off. For example, lights may be programmed to turn on when the ambient light level drops to a certain level, and turn off when it rises again. This type of control is useful for adjusting lighting levels to changing environmental conditions, but it can be affected by artificial light sources and shadows.
Motion sensors use infrared technology to detect movement and turn lights on and off accordingly. For example, lights may be programmed to turn on when someone approaches and turn off after a set period of time. This type of control is useful for providing security and reducing energy waste, but it can be prone to false alarms and may not be effective in areas with low levels of activity.
**Examples of Street Lighting Controls
Cities around the world are using a variety of street lighting controls to save energy and improve safety. Here are a few examples:
Los Angeles, California, USA - In 2013, Los Angeles began a program to retrofit 141,089 streetlights with LED fixtures and remote monitoring sensors. The sensors allow city officials to monitor lighting levels and energy usage, and adjust lighting levels remotely as needed.
Copenhagen, Denmark - In 2019, Copenhagen began a pilot program to install motion sensors on streetlights in the Nørrebro neighborhood. The sensors turn lights on to full brightness when someone approaches, and dim them to 20% when no one is around. The program has been successful in reducing energy consumption and improving safety.
Nairobi, Kenya - In 2019, Nairobi began installing solar-powered streetlights with motion sensors in the Kibera slum. The lights turn on when someone approaches, and turn off after a set period of time. The program has been successful in providing lighting to areas without reliable access to electricity, as well as reducing crime and improving safety.
**Conclusion
In conclusion, there are many different types of street lighting controls available, each with advantages and disadvantages. Manual controls are simple and traditional, but require human intervention and lack flexibility. Automatic controls are becoming more popular due to their energy efficiency and flexibility, and include time-based, photoelectric, and motion sensor controls. Cities around the world are using a variety of street lighting controls to save energy and improve safety.
