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How to Solve the Power Supply Problem in the Application of LED Street Lamps

In the application of LED street lamps, there is a problem of configuring lighting engineering according to the "power" index of lamps. However, if the overall lamp efficiency and utilization of LED lamp and sodium lamp are not correctly grasped, it is easy to lead to insufficient luminous flux or too bright ground, as shown in Figure 7. This is because what we need is the brightness of the ground. According to the characteristics of ground materials, we can get the illuminance of the ground, get the required luminous flux according to the illuminance range, and reverse the luminous flux of lamps according to the utilization rate, maintenance coefficient and lamp layout. After obtaining the determined luminous flux, we can calculate the power according to the efficiency of the lamp. If electricity is used directly, the above uncertain factors will affect the suitability of electricity selection.

How to Solve the Power Supply Problem in the Application of LED Street Lamps 1

1. There are no safety and effect indicators in lighting design, such as LAV, U0, UL, Ti, Sr, i80, etc. road lighting needs to be evaluated, but there are safety and lighting effect indicators. Lav is an index affecting driving safety and traffic capacity; U0 is the index affecting driving safety and traffic capacity; UL is an index affecting driving safety; Ti is an index affecting driving safety; SR is an index affecting driving comfort; I80 is an indicator of driving comfort. It should be noted that the brightness is related to luminous flux / ground reflection coefficient / observation angle / projection plane size, etc. Illuminance is the luminous flux received per unit area, which does not fully correspond to the light required by the human eye. Drivers usually see roads 60 160 meters away and see the brightness reflected to human eyes. The illumination index cannot replace the brightness index. The conversion luminance coefficient Q between illuminance and luminance is nonlinear along the driving direction. The more uniform the illumination, the more uniform the brightness is not necessarily.

Therefore, UE cannot replace UL. From the light distribution effect based on illuminance and brightness, for the light distribution based on "high illumination uniformity", the measured UL is less than 0.7, and there will be obvious zebra crossing on the ground; According to "high total uniformity based on brightness", the measured UL is greater than 0.7. Compared with the lighting effect of sodium lamp and led under the same UL, the light distribution characteristics of sodium lamp shade determine that there is more stray light, and the more accurate the light cutting effect of LED, the less stray light. Stray light can make up for the lack of brightness in dark areas, or make the brightness change less drastic. Compared with white LED, the light source color of sodium lamp after light attenuation is closer to asphalt pavement, the color contrast of sodium lamp is low, and the recognition ability of light and dark in sodium lamp environment is low. Therefore, under the same UL, sodium lamp and LED light source are more likely to produce zebra crossing. In addition, it is found that ti10% is easy to exceed the standard, and ti20% glare is not prohibited. If not controlled, there may be a trend towards disability or an increase in the degree of "disability". I80 is greater than 200cd / m2, and the lighting area of lamps is small (such as combined street lamps), which is easy to produce uncomfortable glare.

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