Design method of height and distance of solar guide light
The average illuminance of the road surface is one of the evaluation indicators for the lighting of traffic roads and pedestrian roads, and it is also an important reference indicator for how to design and configure street lights. LED street lamp manufacturers are a kind of solid-state cold light source, which has the characteristics of environmental protection, no pollution, low power consumption, high luminous efficiency, and long life. Therefore, LED street lamps will become the choice for energy-saving road lighting. LED street light is a kind of high-efficiency solid-state light source formed by semiconductor PN junction that can emit light with weak electric energy. Under a certain forward bias voltage and injection current, the holes injected into the P zone and the electrons injected into the N zone are in After being diffused to the active area, photons are emitted through radiation recombination, which directly converts electrical energy into light energy. In order to use solar LED street lights to configure or replace urban or rural roads, the calculation of lighting-related indicators should first be considered. LED street light is a kind of high-efficiency solid-state light source formed by semiconductor PN junction that can emit light with weak electric energy. Under a certain forward bias voltage and injection current, the holes injected into the P zone and the electrons injected into the N zone are in After being diffused to the active area, photons are emitted through radiation recombination, which directly converts electrical energy into light energy. The "utilization coefficient" method is a simple and effective method.
The formula calculated by the "utilization coefficient" method absolutely reflects the conclusions of traditional lighting theory research. What we have to do is to input some experimental or theoretical data of LED street lights into the formula, and get the result and compare it with the requirements of the road lighting design standard. It goes without saying that these calculations are also necessary for the design, development, improvement, improvement and marketing of LED street lights.
1 concept
The utilization factor (u) is the ratio of the luminous flux directly irradiated on the road surface to the luminous flux emitted by all light sources, and it is related to the height, height, layout and width of the street lamp.
Luminous flux (π) is the sum of the energy emitted by the light source and the energy received by the human eye. Indicates how much light energy is radiated per unit time, with lm as the unit. Other expressions: cd.sr (cd is the unit of luminous intensity: candela. sr is the unit of three-dimensional angular surface degree.
Illuminance (E) is the proportional coefficient between the luminous flux and the illuminated area in LuxLX. 1Lx refers to the average luminous flux of 1lm distributed in the region of 1m2 energy (ie lm/m2).
The average illuminance of the road surface (EAV) is the average value of the illuminance of each point measured or calculated at the preset points on the road surface according to relevant regulations.
The maintenance factor (k) refers to the ratio of the average illuminance or average brightness on the specified surface to the average illuminance or average brightness obtained on the same surface when the equipment is newly installed under the same conditions after a period of use.
The installation height of the lamp (h) is the vertical distance from the light center of the lamp to the road surface.
The installation distance between the lamps is the distance between two adjacent lamps measured along the centerline of the road.
The cantilever length (XL) is the horizontal distance from the center of the lamp of the lamp to the adjacent side edge, that is, the horizontal distance of the lamp extending or retracting the rim.
The effective width of the road surface (WEFF) is the theoretical width of the road surface used for road lighting design. It is related to the actual width of the road, the cantilever length of the lamps and the arrangement of the lamps.
2 Calculation formula
According to the definition of illuminance, e=<s>/a
(1) In the formula, A- irradiation area, M2
Average illuminance of road surface, Eav = F / (W * S)
(2) In the formula, f- the rated luminous flux of the street light source, lm;
Road width, m.
Benwei Solar Street Lights Outdoor Lamp
Product Features:
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>5 years warranty.
