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low emc qualification rate of led lighting products
release time: 2015-06-30views: 437

the 2014 led lighting products supervision and spot check quality analysis report released by jiangsu provincial bureau of quality and technical supervision recently shows that there are many quality problems in products on sale. a total of 103 batches were randomly selected in this supervision and random inspection, of which 53 batches were randomly selected in the production field, and 47 batches were qualified, with a pass rate of 88.7%.

there are 50 batches of product quality risk monitoring on the market, and 15 batches are qualified, with a qualification rate of 30%.

low qualification rate of electromagnetic compatibility

electromagnetic compatibility (emc) refers to the ability of equipment or system to meet the requirements in its electromagnetic environment and not produce unbearable electromagnetic interference to any equipment in its environment. among the 103 batches of led lighting products selected in this spot check, 62 batches of emc projects are qualified, with a qualification rate of

only 60.2%. it is 9.2 percentage points lower than that of self ballasted fluorescent lamps (energy-saving lamps) for general lighting, while incandescent lamps do not have electromagnetic compatibility problems. therefore, the emc performance of led lighting products needs to be further improved. among them, 55 batches of led lighting products from jiangsu real estate (5 batches are in

market sampling), 48 batches of emc projects are qualified, 7 batches are unqualified, and the qualification rate is 87%. the city purchased 48 batches of led lighting products produced in other provinces and cities, 14 batches of electromagnetic compatibility projects were qualified, 34 batches were unqualified, and the qualification rate was 29%.

unqualified electromagnetic compatibility (emc) may cause the distribution system or other electronic and electrical products connected to the system to fail to work normally, such as unclear tv images, noise of audio equipment, etc. under special circumstances, such as batch installation of electromagnetic compatibility (emc) is unqualified

products will overheat electrical equipment, produce vibration and noise, aging insulation, shortening service life, and even failure or burning.

5. category 1 blue light hazard in the product

under certain conditions, the blue light component in the led spectrum for lighting will cause damage to the human optic nerve. gb/t 20145-2006 “photobiosafety of lamps and lamp systems” divides the hazard level into 4 categories, with category 0 as non hazardous, category 1 as low hazard, category 2 as medium hazard and category 3 as high hazard

danger the classification basis is determined by the total exposure, exposure distance, angle and other factors. generally speaking, for category 1 hazards of led blue light, the general use distance is more than 1.5 meters, or non long-term use (generally less than 2-3 hours) is not harmful to people. in this led supervision and spot check

, 5 batches of products were found to have category 1 blue light hazards.

the color rendering index has higher room for improvement

to evaluate whether a lighting product is energy-saving, we usually use electro-optical power conversion efficiency (light efficiency), lighting effect (color temperature, color rendering index) and other indicators to evaluate. in theory, the electro-optical power conversion efficiency of led lamps can reach 100%, and the same lighting effect can save more than 80% energy than traditional light sources

the service life can reach 60000 to 100000 hours, which is more than 10 times longer than that of traditional incandescent lamps and energy-saving lamps. this supervision and inspection of led lighting products focused on three indicators: initial light efficiency, color temperature and color rendering index. among them, the initial lighting effect reflects the energy-saving situation of led lighting products, and the color

mild color rendering index is related to human visual perception and comfort.

the greater the initial luminous efficiency, the more energy-saving. in this provincial supervision and spot check, there are 5 batches with initial luminous efficiency greater than 100 lm / w. among them, the median initial luminous efficiency of led lighting products in jiangsu province is 80 lm/w, and the median initial luminous efficiency of commercially available led lighting products is 60 lm / w. contrast energy saving

according to the provincial supervision and spot check results of lamps, the median initial luminous efficiency of energy-saving lamps in jiangsu enterprises is 64 lm/w, and the median initial luminous efficiency of energy-saving lamps purchased from the city is 41 lm / w. the initial luminous efficiency of incandescent lamps is usually 8-15 lm / w. the initial luminous efficiency of led lamps is significantly higher than that of incandescent lamps and energy-saving lamps

look, leds are really more energy-saving.

the higher the color temperature, the lower the comfort of people. for white led, its color will be cyan when it exceeds 7000k. working or living in this ultra-high color temperature environment for a long time will make people feel very uncomfortable and even endanger their health. therefore, the newly issued national standards

gb29294-2012 performance requirements for led downlights stipulates that it is recommended that the relevant color temperature of household led downlights should not exceed 5000k. the standard stipulates that led downlights with 5700k and 6500k related color temperatures are limited to commercial lighting. in this spot check, the relevant color temperature of 90% of led lighting products is acceptable

the acceptance range is 3000k-7000k. however, there are also 4 batches of more than 7000k, and some products even reach 8900k.

the maximum color rendering index is 100. the higher the value, the better the quality. the spot check results show that the median value of the color rendering index of real estate led lighting products is about 75, and the median value of the color rendering index of commercial led lighting products is about 70. according to the spot check results of energy-saving lamps, the color rendering index of energy-saving lamps in jiangsu real estate is

the median value is 83, and the median value of color rendering index of commercially available energy-saving lamps is 76. the color rendering index of incandescent lamps is usually 100. this shows that the color rendering of led lighting products in this supervision and random inspection is still good, but it is still lower than the average level of incandescent lamps and energy-saving lamps, and there is still high room for improvement.

five things to look at when shopping

once we check whether the product identification is complete, the identification of formal products is often more standardized, and at least the following contents should be identified: trademark and factory name, product model and specification, rated voltage, rated frequency and rated power. check whether the product model is consistent with the model of the inspection report and certification certificate

whether the specifications are consistent and whether the electrical parameters are correctly identified. second, check whether the power line of led lamps has ccc safety certification mark, and the power line should not be too thin. iii. check whether the electrified body of led lamps is exposed. after the light source is installed into the lamp holder, fingers should not touch the electrified metal lamp cap; there should be no fingers on the lamp

in order to touch the holes and seams of live parts. fourth, the light color performance of led lamp products directly reflects the quality and performance of products. for household led lighting products, it is recommended to choose products with relevant color temperature not higher than 5000k, warm white light or yellow light.

 

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