Streetlights Knowledge About Street Lighting2

1. Brief history

Lighting fixtures had to be installed outside the windows facing residential streets in Paris at the beginning of the 16th century. Many streetlights appeared on the streets of Paris at fourteen Louis. Louis XIV, also known as the "Sun King," officially promulgated the Urban Road Lighting Act in 1667. According to legend, it was precise because of the promulgation of this decree that Louis XIV's reign was dubbed the "Bright Age" in French history.

Streetlights use lighting technology and are appropriate for streetlights. The goal is to create an electronic energy-saving street lamp with long life, low power consumption, a high-power factor, and a low current harmonic content. The high-efficiency electronic energy-saving streetlamp includes power grid high-voltage leakage branches R1 and C1, rectifier bridges D1-D4, power factor correction branches C2, D5, and D6, high-intermediate frequency glitch filter branches L1, L3, and high-frequency oscillation circuits connected in sequence BG1-BG2, start branch L2, C7, and tube T; saves electricity by 80% compared to the previous streetlamp; harmonic content THD 25%, extends the life.

2. Design guidelines for urban street lighting

The urban road lighting design standard is a state-issued standard used to regulate lighting requirements in the construction of urban roads. Please see "Urban Road Lighting Design Standards" for more information. Within the city, roads with specific technical conditions and facilities for vehicles and pedestrians. Urban roads are classified into expressways, main roads, secondary roads, branch roads, and residential roads based on their status in the road network, transportation functions, and service functions of buildings and urban residents along the roads.

3. Parameter for lighting

The efficiency of a luminaire is defined as the ratio of the total luminous flux emitted by the luminaire to the total luminous flux emitted by all light sources contained within the luminaire under identical operating conditions. After a specified period of use, the ratio of the average illuminance or average brightness on a specified surface to the average illuminance or average brightness is obtained when the device is newly installed under the same conditions. The vertical distance between the light center and the road surface is called the luminaire mounting height. Spacing between luminaires.

Road width is effective. The theoretical width of the pavement used in road lighting design is proportional to the road's actual width, the lamp overhang length, and the lamp arrangement. When all the lamps are on one side, the effective road width equals the actual road width minus one overhang length. When the lamps are staggered and opposite on both sides, the effective road width equals the actual road width minus two overhang lengths. When the lamps and lanterns are symmetrically arranged in the center of the double-strip road, the effective width of the road equals the road's actual width.

Inductive direction. Properly installed light poles and lamps along the road can provide drivers with visual information about the forward direction, line shape, and slope of the road, a property of lighting facilities called inductiveness.

The brightness of the road surface is average. The International Commission on Illumination's (CIE) relevant regulations defines the average value of the brightness of each point measured or calculated at a preset point on the road surface.

Elevation angle of lamp: The elevation angle of each street is determined by the street width of the lamp and the lamp's light distribution curve. When the lamp head is adjustable, the light source's centerline should be between L / 3 and 1 / 2 of the road width. After installing the lamp body, the lamp head side of the long arm lamp (or arm lamp) should be 100 mm higher than the pole side.

4. Parameter for the pavement

The longitudinal uniformity of the luminance of the road surface. The ratio of the lowest to highest brightness along the same lane centerline. The illuminance of the road surface on average. The average value of each point's illuminance is measured or calculated in accordance with applicable CIE regulations at predetermined points on the road. Illuminance uniformity on the road surface. The ratio of the road's minimum illumination to the road's average illumination. maintained the road surface's average illuminance It is the average brightness used in the design calculation after factors such as attenuation of luminous flux when the light source is to be replaced and lamp efficiency decline due to pollution (i.e., maintenance factor) are considered. the upward ratio of light. When the luminaire is installed, the luminous flux emitted in the horizontal direction and above constitutes a percentage of the luminaire's total luminous flux.

Glare. A visual phenomenon that produces an unpleasant sensation or impairs one's ability to observe an object or detail due to an insufficient brightness distribution or brightness range in the field of view, or due to excessive contrast.

The ratio of surrounds. The ratio of the average horizontal illuminance outside the roadway in a 5m wide area to the average horizontal illuminance on an adjacent 5m wide roadway.

Areas of contention. Areas such as road entrances, intersections, and crosswalks are included. Between vehicles, lighting power density is high in this area (of the road surface). Power consumption of lighting installation per square meter of pavement (including ballast power consumption).

Unit of remote terminal control. The slave station is a device that is monitored by the master station and performs protocol-specific functions such as remote data collection, processing, sending, receiving, and output execution.