The indicator and performance of Led street light

LED street light is the most important performance index is its photosynthetic efficiency as a whole. A whole photosynthetic efficiency is output flux (lumens) and the ratio of the input electric power, the unit is the number of lumens per watt lm/W.
It not only includes the luminous efficiency of the LED itself, also includes the constant current power supply efficiency and blister light transmittance. In addition, also its color temperature, color rendering index, etc.
In order to test the index of the LED dome light, we usually put it in the large integral ball, in order to measure all the luminous flux emitted from it. And analyze the spectrum emitted from it.
Now take the infrared remote control is shown in figure 7 LED to absorb dome light, for example, test its performance. This is a used 168 3014 the infrared remote control led to absorb dome light.
When not mask the measured results are as follows.
1. The whole light efficiency
The total number of lumens 1383 lm, the input ac power = 16.57 W, so the overall lighting = 83.46 lm/W to be sure which includes two efficiency, the efficiency of an infrared receiver, the other is a constant current power supply efficiency. And the efficiency of the constant current power supply, separate test results is 89.5% (figure 8). Infrared receiver power consumption is about 0.5 W, so the actual input power should be 16 W. If it’s not the infrared remote control, its overall photosynthetic efficiency should be 86.43 lm/W. If we consider the efficiency of power supply, with electric power on LED 14.32 W.
So it can get 96.5 lm/W. This should be the LED luminous efficiency of itself. If use the LED luminous efficiency is 120 lm/W, so its overall photosynthetic efficiency can reach 107 lm/W, power consumption, even with infrared receivers whole photosynthetic efficiency also can be more than 100 lm/W.
2. The color temperature
Color temperature: 6171 k, this is completely determined by the LED, if the user requires low color temperature, can convert low color temperature of LED.
3. The color rendering index
According to index: Ra = 76.2, the index is relatively low. But in reality currently used color rendering index is on 15 kinds of monochromatic light color rendering index of average results, it is not entirely represent its color. So the lighting information committee (CIE) is not recommended to determine the color of LED street light with CRI ability.
4. If combined with mask, its photosynthetic efficiency will, of course, decreases as a whole. And will reduce a lot. So choose high light transmittance of the mask is very important. But high light transmittance, will enable users to see the light bead, this is also don’t want to. Especially if use 1 w high power LED, is even more apparent, USES the small power leds used (e.g., 3014), allows for high light transmittance of mask, it is also very important.


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