If a small amount of current flows from the emitter to the base, a large amount of current can flow from the emitter to the collector. In other words, if the base is grounded, the switch is turned on (the path from the emitter to the collector). So when the light illuminates the photocell, it turns on the transistor, which activates the relay electromagnet, which turns off the light. When it is dark, the resistance of the photocell is very high, so no current flows through the base, the relay does not operate, and the light is on.

Electricity is delivered through high-intensity discharge lamps. High-intensity discharge lamps emit light through an arc created between two electrodes. The electrodes are located in transparent tubes filled with gas and metal salts. The arc generates heat, which, along with the gas and metal, creates a glowing plasma.

Photovoltaic cells are semiconductors, which are photodetectors. They are basically light-dependent resistors because their output is proportional to the amount of light falling on them. Due to this effect, they are also called photoresistors or photoresistors. Photovoltaic cells convert light energy into electricity.

When no light is present, they have very high resistance, possibly millions of ohms. Conversely, when there is light, its resistance is greatly reduced to a few hundred ohms. This allows more current to flow into the circuit. These lamps are superior to other lamps, such as mercury and metal halide lamps, because low-pressure sodium lamps emit lower-intensity monochromatic light.

Public lighting systems require ongoing maintenance and can be either reactive or preventative. The pupil of the eye does not adjust fast enough when going from dark to light and vice versa, which can cause problems. These reverb cast far brighter light, enough for some to complain about glare. For one, they emit a strong, intense light, which, while useful in industrial places like shipyards, is uncomfortable on ordinary streets in cities.

Street lighting serves three primary purposes: improving pedestrian and vehicular safety, reducing street crime, and providing nighttime service in community spaces. Full-cut street lights also reduce light pollution by reducing the amount of light that hits the sky directly, which also improves the luminous efficiency of light. While LED technology dominates at higher performance levels, some street lighting designs using LEDs provide poor performance results, suggesting that achieving an efficient street lighting solution is a combination of product choice and good design.

Previously, public lighting control was accomplished through centralized control of entire areas or entire lines. To avoid the danger of a car driving through a pool of light, beacon lights should never be on main roads, nor should they be on secondary roads. A relay is basically an electromagnetic switch; when the electromagnet has a high current flow (a lot of light falls on the photoresistor during the day), it pushes the switch so that no current flows to the street light.

To prevent the entire system from shutting down if a single light burns out, each street light is equipped with a device to ensure the circuit remains intact. The earliest lights were used by Greek and Roman civilizations, where lights were primarily used for security purposes, both to protect wanderers from tripping over things on the road, and to keep potential thieves out.

The above briefly describes the working principle of street lights. If you want to buy streetlights, please contact us.

TFB Lighting is a professional custom outdoor landscape light manufacturer. The company covers an area of more than 8,000 square meters and has large scissors, folding equipment, automatic spraying lines, welding production lines, lathes, drilling machines, milling machines, planers, punching machines, machining production lines, etc. . The company mainly produces all kinds of garden lamps, street lamps, floor lamps, lawn lamps, wall lamps, underwater lamps, wall lamps, spot lamps, solar energy and landscape lighting and other products. There are many varieties and high quality and are widely used in decorative lighting in various roads, squares, parks, villas, pedestrian streets, garden communities and other places.