[Text / high-tech LED reporter Zhu Chunwei] The biggest advantage of LED lamps compared to traditional incandescent lamps is energy saving, using ultra-high-bright high-power LED light source, with high-efficiency power supply, saving more than 80% of electricity compared with traditional incandescent lamps, brightness under the same power It is 10 times that of incandescent lamps.
An important parameter that determines whether an LED luminaire is energy efficient is the PF value (power factor), which is the ratio of active power to apparent power in the AC circuit: power factor = active power / apparent power. The low power factor indicates that the reactive power for the alternating magnetic field throughput conversion in the circuit is large, thereby reducing the utilization of the device and increasing the line power loss.
However, many of the finished lamps sold in the market generally do not have this parameter, even if it is marked, it is far from the measured value.
According to the high-tech LED fifth round CLEAR test project, 32 brands of a total of 40 models of 3 W LED bulb data display: clearly identified the PF value of a brand of 2 models of good products, marked as 0.5, the actual measurement is only 0.1906, 0.4645, the PF value identification rate of all samples is only 5%; unidentified, but the tested PF value is 0.5 or above, there are 2 brands totaling 3 models, respectively 0.6221, Philips 0.5263 and 0.5251, according to the US Energy Star standard requirements (power factor 0.5 standard), the test product pass rate is only 7.5%.
Example of PF value distribution for 40 models
The reporter learned that the current relatively small power bulbs such as 3W LED bulbs are generally used in homes, shops, etc., and the amount will not be large. Therefore, the impact on the power grid is relatively small, and the power consumption per unit is also very limited. Many consumers do not care about this. Only in the case of relatively large quantities, such as large supermarkets, factories, etc., will pay attention to the PF of the lamps when purchasing.
"At the same time, the relevant national departments are not very strict on the PF value of small and medium power lamps. In addition, the corresponding PF value will change the design of the drive power supply, and the corresponding cost will increase the lamp." An industry insider told Reporter, this is a parameter that many companies that use price as a means of competition are not willing to focus on.
2013 fifth round CLEAR plan LED bulb lamp PF value detection results publicity
An important parameter that determines whether an LED luminaire is energy efficient is the PF value (power factor), which is the ratio of active power to apparent power in the AC circuit: power factor = active power / apparent power. The low power factor indicates that the reactive power for the alternating magnetic field throughput conversion in the circuit is large, thereby reducing the utilization of the device and increasing the line power loss.
However, many of the finished lamps sold in the market generally do not have this parameter, even if it is marked, it is far from the measured value.
According to the high-tech LED fifth round CLEAR test project, 32 brands of a total of 40 models of 3 W LED bulb data display: clearly identified the PF value of a brand of 2 models of good products, marked as 0.5, the actual measurement is only 0.1906, 0.4645, the PF value identification rate of all samples is only 5%; unidentified, but the tested PF value is 0.5 or above, there are 2 brands totaling 3 models, respectively 0.6221, Philips 0.5263 and 0.5251, according to the US Energy Star standard requirements (power factor 0.5 standard), the test product pass rate is only 7.5%.
Example of PF value distribution for 40 models
The reporter learned that the current relatively small power bulbs such as 3W LED bulbs are generally used in homes, shops, etc., and the amount will not be large. Therefore, the impact on the power grid is relatively small, and the power consumption per unit is also very limited. Many consumers do not care about this. Only in the case of relatively large quantities, such as large supermarkets, factories, etc., will pay attention to the PF of the lamps when purchasing.
"At the same time, the relevant national departments are not very strict on the PF value of small and medium power lamps. In addition, the corresponding PF value will change the design of the drive power supply, and the corresponding cost will increase the lamp." An industry insider told Reporter, this is a parameter that many companies that use price as a means of competition are not willing to focus on.
2013 fifth round CLEAR plan LED bulb lamp PF value detection results publicity
(Note: blue is the online shopping product, yellow is the product without label, self-defined number)
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