Trystan Casey
Street lights are a raised source of light on the edge of a road or path, and they have been in use since the 19th century. They are an important source of public security lighting intended to reduce crime. Many street lights are now being made more energy-efficient with the use of light-emitting diodes (LEDs) and intelligent street light controllers. These controllers can include Global Positioning Systems (GPS) and traffic sensors to manage the lux level of the lamp according to the traffic. So, are street lights controlled by electric eyes?
| Characteristics | Values |
|---|---|
| Control Methods | Timing Control, Remote Control, Light Control Sensor |
| Power Source | Public grid-provided AC power |
| Voltage | 120V in the US and Canada, 220V-240V in Europe |
| Current | 0.1-1 amp |
| Energy Conservation Options | Twilight saving, staggering, dimming |
| Communication | GSM, RF, GPRS |
| Traffic Sensors | Manage lux level of the lamp according to traffic |
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What You'll Learn
- Street lights are controlled by light-sensitive photocells or photoelectric controls
- Sensors or timers allow street lights to turn on and off automatically
- Street light controllers are smarter versions of mechanical or electronic timers
- Street light control systems are developed to reduce a town's public lighting energy consumption
- Street lights in the US and Canada typically use 120V, while in Europe, it's 220V-240V
Street lights are controlled by light-sensitive photocells or photoelectric controls
Street lights are an important source of public security lighting intended to reduce crime. They are also a significant expense for cities, which has driven the development of control systems to reduce energy consumption.
Today, street light controllers are smarter versions of the mechanical or electronic timers previously used for simple ON-OFF operation. They come with energy conservation options like twilight saving, staggering, or dimming. Many street light controllers come with an astronomical clock or a Global Positioning System (GPS) connection to optimize ON-OFF times and energy savings.
Some street light controllers also come with traffic sensors to manage the lux level of the lamp according to the traffic flow, saving energy by decreasing lux when there is no traffic. This is an example of light control sensing, which adjusts street light brightness in response to surrounding light intensity. The other primary control method is timing control, which switches street lights on and off according to a preset schedule.
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Sensors or timers allow street lights to turn on and off automatically
Street lights are an important source of public security lighting intended to reduce crime. They are powered by the utility grid, with standard voltages of 120V in the United States and Canada, and 220V-240V in Europe. Street lights can be controlled by sensors or timers, allowing them to turn on and off automatically.
Sensors or timers enable street lights to operate automatically, enhancing public safety and energy efficiency. Sensors, such as light control sensors, can detect ambient light intensity, automatically adjusting the brightness of LED street lights. This sensor design is often cylindrical, placed atop the street lamp shade to optimize light signal reception. Sensors offer greater flexibility and intelligence in street light control, allowing dynamic adjustments based on surrounding light conditions.
Timing control, on the other hand, relies on preset schedules to switch street lights on and off within specific time periods. This method is still prevalent, especially in older street light systems, due to the higher costs and implementation challenges associated with sensing technology. Additionally, some areas require lighting within specific time frames, making timing control a necessary option.
Street light controllers, more advanced versions of mechanical or electronic timers, offer energy conservation features like twilight saving, staggering, and dimming. These controllers may be equipped with an astronomical clock or a Global Positioning System (GPS) to optimize ON-OFF times and energy savings. Intelligent controllers may also support communication technologies like GSM, RF, or GPRS, enabling better street light management and maintenance.
In summary, sensors or timers play a crucial role in automating street light operations, enhancing public safety, and reducing energy consumption. While timing control provides a cost-effective solution, particularly for older systems, sensors offer increased flexibility and responsiveness to ambient light conditions. As technology advances, sensors are expected to become more popular, further improving the efficiency and adaptability of street lighting systems.
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Street light controllers are smarter versions of mechanical or electronic timers
Street light controllers are advanced versions of the mechanical or electronic timers previously used for street light ON-OFF operation. They are designed to be smarter and more efficient, offering various energy conservation options such as twilight saving, staggering, and dimming. These controllers are a significant upgrade from the traditional timers, which often relied on a single switch or clock to control all the lights in an entire district.
Street light controllers come equipped with advanced features like astronomical clocks or Global Positioning System (GPS) connections. These features enable them to determine the optimal ON-OFF times for street lights, maximizing energy savings. The controllers can also be user-adjusted according to latitude and longitude, providing better street light management and maintenance.
Additionally, intelligent street light controllers may include communication capabilities such as Global System for Mobile Communications (GSM), Radio frequency (RF), or General Packet Radio Service (GPRS). These communication technologies further enhance the management and maintenance of street lights.
Many street light controllers also have traffic sensors that can adjust the lux level of the lamp according to traffic conditions. By decreasing the lux when there is no traffic, these sensors contribute to energy conservation. This sensor-based control system offers greater flexibility and intelligence compared to traditional timing control systems.
The evolution of street light controllers from mechanical timers to smart controllers showcases the ongoing efforts to improve energy efficiency and street light management in towns and cities.
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Street light control systems are developed to reduce a town's public lighting energy consumption
Street light control systems are an important tool in reducing a town's public lighting energy consumption. Street lighting is a major component of total energy consumption in cities, accounting for about 40% of total energy consumption. The high energy consumption of street lighting systems contributes significantly to environmental pollution, with the electricity powering the lights producing carbon dioxide emissions and nuclear dust.
Street light control systems are a way to reduce the energy consumption of a town's public lighting system. These systems can be manual or remote, and they can be used to monitor and control the lighting remotely. This can be achieved through the use of smart street lights, which can be equipped with motion sensors that detect human presence and adjust their brightness accordingly. This not only improves public safety and comfort but also reduces energy waste and carbon emissions. Additionally, smart street lights often have built-in ambient light sensors that regulate illumination based on the natural light available, further reducing energy consumption.
Another way to reduce energy consumption is by using light-emitting diodes (LEDs) instead of high-pressure mercury (HPM), metal halide (MH), or high-pressure sodium (HPS) luminaires. LEDs produce a whiter light and can be installed as part of a centrally managed system with energy-saving controls such as part-night lighting and dimming. While the upfront costs of installing LED fixtures are significant, municipalities can expect to recoup their investment through reduced electricity and maintenance costs.
Furthermore, street light controllers are smarter versions of the mechanical or electronic timers previously used for street light operation. They offer energy conservation options like twilight saving, staggering, or dimming. Many of these controllers come with an astronomical clock or a Global Positioning System (GPS) connection to optimize ON-OFF times and energy savings. Some even have Global System for Mobile Communications (GSM), Radio Frequency (RF), or General Packet Radio Service (GPRS) communication for better street light management and maintenance.
By implementing these street light control systems, towns can reduce their public lighting energy consumption, decrease environmental pollution, and improve public safety and comfort.
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Street lights in the US and Canada typically use 120V, while in Europe, it's 220V-240V
Street lighting has a long and fascinating history, with many changes and developments over the years. The US and Canada typically use 120V for their street lights, while Europe uses 220V-240V. This difference in voltage standards can be traced back to Thomas Edison and his light bulb invention.
Edison's first successful incandescent light bulb was tested in 1879, using a coiled carbon filament connected to platina contact wires. This development sparked the War of the Currents, with alternating circuit companies adopting 110V distribution for lighting systems and 220V for major appliances. Over time, the voltage gradually increased, reaching the current standard of 120/240V at 60 Hz in 1967, with the 120V standard remaining for lighting.
In the US, street lighting has evolved from early gas lights in the mid-19th century to electric lighting in the late 19th century. The first public demonstration of outdoor electric lighting in the US took place in Cleveland, Ohio, in 1879, by inventor Charles F. Brush. This dynamo arc light system provided a glow equivalent to 4,000 candles in a single lamp, impressing thousands of onlookers. The city of Wabash, Indiana, became the first in the world to be lit by electricity on March 31, 1880, using the Brush arc lighting system.
The US has seen a transition from mercury vapor streetlights in the 1950s to the more recent adoption of light-emitting diodes (LEDs). LEDs offer higher energy efficiency, producing a whiter light, and can be centrally managed with energy-saving controls. This shift is expected to reduce ongoing electricity and maintenance costs for municipalities.
In Europe, Germany's switch to the 220V system at the beginning of the 20th century influenced the rest of the continent to follow suit, eventually increasing to the current standard of 230V. This decision by Germany also led to the world having two standard currents: 50 Hz and 60 Hz.
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Frequently asked questions
Street lights have four control methods: timing control, remote control, light control sensor, and traffic sensors. The light control sensor adjusts the brightness of the street light in response to the surrounding light intensity, effectively saving energy.
Timing control allows street lights to turn on and off automatically through a preset schedule. Timing control usually requires timers or a centralized control system.
Light control sensing allows street lights to adjust their brightness in response to surrounding light intensity. This is made possible by light-sensitive photocells that activate the lamp automatically when needed, at times when there is little-to-no ambient light, such as at dusk, dawn, or the onset of dark weather conditions.
Traffic sensing uses traffic sensors to manage the lux level of the lamp according to the traffic and to save energy by decreasing lux when there is no traffic.
