How to solve the power problem in the application of LED street lamps

How to solve the power problem in the application of LED street lamps In the application of LED street lamps, there is a problem of configuring lighting projects based on the "power" index of lamps. However, if the overall lighting efficiency and utilization rate of LED lamps and sodium lamps are not correctly grasped, it is easy to cause insufficient luminous flux or excessively bright ground, as shown in Figure 7. This is because what we need is the brightness of the ground. Based on the characteristics of the ground material, we can get the illuminance of the ground, obtain the required luminous flux according to the illuminance range, and reverse the luminous flux of the lamps according to the utilization rate, maintenance factor, and arrangement of lamps.

After obtaining the determined luminous flux, we can calculate the power according to the efficiency of the lamp. If electricity is used directly, many uncertain factors above will affect the suitability of electricity selection. 1. Lighting design has no safety and effect indicators, such as Lav, U0, UL, TI, SR, I80, etc.

It is required to evaluate road lighting, but there are safety and lighting effect indicators. Lav is an indicator affecting driving safety and traffic capacity; U0 is an indicator affecting driving safety and traffic capacity; UL is an indicator affecting driving safety; TI is an indicator affecting driving safety ; SR is an index affecting driving comfort; I80 is an index affecting driving comfort. It should be noted that brightness is related to luminous flux/ground reflection coefficient/observation angle/projection surface size, etc. Illuminance is the luminous flux received per unit area, which does not exactly correspond to the light required by the human eye.

Drivers usually look at the road 60-160 meters away and see the brightness reflected to the human eye. Lighting Index is not a substitute for Brightness Index. The conversion luminance factor Q between illuminance and luminance is non-linear along the driving direction.

The more uniform the illumination, the more uniform the brightness is not necessarily. Therefore, UE cannot replace UL. Judging from the light distribution effect based on illuminance and brightness, based on the "high uniformity of illuminance" light distribution, the measured UL is less than 0.7, and there will be obvious zebra crossings on the ground; according to the "high total uniformity based on brightness", the measured The UL is greater than 0.7.

Comparing the lighting effects of sodium lamps and LEDs under the same Ul, the light distribution characteristics of sodium lamp shades determine that there is more stray light, and the more accurate light-cutting effect of LEDs makes stray light less. Stray light can fill in some lack of brightness in dark areas, or make brightness changes less drastic. Compared with white LEDs, the color of sodium light sources after light attenuation is closer to asphalt pavement, the color contrast of sodium lamps is lower, and the ability to distinguish light and dark under sodium lamp environments is lower.

Therefore, under the same Ul, sodium lamps and LED light sources are more likely to produce zebra crossings. In addition, it is found that TI10% is very easy to exceed the standard, and TI20% glare is not disabled. If left unchecked, disability trends or increased levels of "disability" may occur.

I80 is greater than 200cd/m2, and the lighting area of ​​the lamp is small (such as cob LED street lamp), which is easy to cause uncomfortable glare.