Technical Information
Methods for testing LED lighting fixtures for bridge guardrails
[ 11-08-2024 ]
The inspection of LED lighting fixtures for bridge guardrails involves multiple aspects to ensure the safety, performance, and compliance of the fixtures with relevant standards. Here are some key inspection methods:
At about 0.5 meters from the fixture, visually inspect the outer shell, lampshade, and other parts of the fixture to check for defects such as deformation, scratches, wear, paint loss, stains, etc.
Check whether the logo and label of the fixture are clear and complete and whether the content meets the requirements.
Structural inspection:
Check whether the connections of the various parts of the fixture are firm, whether there are looseness, excessive gaps, etc.
Check whether the screws are tightened, whether the solder joints are firm, and whether the combination of the lampshade and the lamp holder is tight.
Use measuring tools (such as calipers, tape measures, etc.) to measure the external dimensions of the fixture, including length, width, height, etc., and check whether it meets the requirements of the design drawings or product specifications.
Material inspection:
Check whether the materials used in each part of the fixture and its structural design meet the requirements of the drawings and relevant standards.
For the materials used in lamps, such as plastics, metals, electronic components, etc., check whether they contain harmful substances such as lead, mercury, cadmium, hexavalent chromium, etc.
Use equipment such as integrating spheres to measure the luminous flux emitted by lamps, that is, the total amount of light emitted by the light source. The unit of luminous flux is lumen (lm), and the test result should conform to the nominal value of the lamp.
Illuminance test:
Use an illuminance meter to measure the illuminance value of the lamp on a certain plane at a specified distance and angle, that is, the luminous flux received per unit area. The unit of illuminance is lux (lx). According to the use scenario and requirements of the lamp, judge whether the illuminance meets the requirements.
Color temperature test:
Use a color temperature meter to measure the color temperature of the light emitted by the lamp. Color temperature is a unit of measurement that indicates the color component contained in the light, and the unit is Kelvin (K). Different color temperatures will give people different visual feelings, such as warm light (low color temperature) giving people a warm and comfortable feeling, while cold light (high color temperature) gives people a bright and refreshing feeling.
Color rendering index test:
Use equipment such as a spectrum analyzer to measure the color rendering ability of lamps for various colors, expressed as the color rendering index (Ra). The higher the color rendering index, the stronger the ability of the lamp to restore the color of the object. Generally, the color rendering index of indoor lighting fixtures should be greater than 80.
Light intensity distribution test:
Use a distribution photometer to measure the light intensity distribution of the lamp at different angles and draw a light intensity distribution curve. The light intensity distribution curve can reflect whether the light distribution of the lamp is uniform and whether it meets the design requirements.
Use equipment such as a multimeter to measure the input voltage and current of the lamp under normal working conditions to check whether it is within the rated range. For AC lamps, it is also necessary to check whether their voltage frequency meets the requirements.
Insulation resistance test:
Use an insulation resistance tester to measure the insulation resistance of the lamp to ensure that its insulation performance is good to prevent safety problems such as leakage. Generally, the insulation resistance is required to be greater than a certain value (such as 2MΩ).
Withstand voltage test: Use a withstand voltage tester to apply a certain high voltage (such as 1500V, etc., the specific value depends on the standard) to the electrical part of the lamp for a period of time, and check whether there are breakdown, flashover and other phenomena to verify the electrical insulation strength of the lamp.
Durability test: Place the lamp under specific environmental conditions (such as high temperature, high humidity, vibration, etc.), work continuously for a certain period of time (such as hundreds of hours or even longer), and then check whether the performance of the lamp has changed, such as luminous flux attenuation, color drift, electrical failure, etc.
Free drop test: For movable lamps or lamps with detachable parts, free drop tests are performed. Drop the lamp from a certain height (such as 1 meter or 2 meters) to hard ground, repeat it several times (such as 3 times or more than 8 times), and check whether the lamp is damaged, deformed, loose, etc.
Check whether the grounding of the lamp is good. Use a grounding resistance tester to measure the grounding resistance of the lamp to ensure that the grounding resistance is less than the specified value (such as 0.1Ω) to ensure that the current can be safely introduced into the earth when an electrical fault occurs.
Anti-electric shock protection test:
Use tools such as test probes to check whether the housing, lampshade, and other parts of the lamp have good anti-electric shock protection measures and whether they can prevent human contact with live parts.
In summary, the detection of LED lighting lamps for bridge guardrails involves many aspects, including appearance and structure inspection, size and material inspection, optical performance test, electrical performance test, environment and reliability test, and safety performance test. These detection methods can ensure the safety, performance, and compliance of the lamps with relevant standards, thereby ensuring the lighting effect and driving safety of the bridge guardrails.
1. Appearance and structural inspection
Appearance inspection:At about 0.5 meters from the fixture, visually inspect the outer shell, lampshade, and other parts of the fixture to check for defects such as deformation, scratches, wear, paint loss, stains, etc.
Check whether the logo and label of the fixture are clear and complete and whether the content meets the requirements.
Structural inspection:
Check whether the connections of the various parts of the fixture are firm, whether there are looseness, excessive gaps, etc.
Check whether the screws are tightened, whether the solder joints are firm, and whether the combination of the lampshade and the lamp holder is tight.
2. Dimension and material inspection
Dimension inspection:Use measuring tools (such as calipers, tape measures, etc.) to measure the external dimensions of the fixture, including length, width, height, etc., and check whether it meets the requirements of the design drawings or product specifications.
Material inspection:
Check whether the materials used in each part of the fixture and its structural design meet the requirements of the drawings and relevant standards.
For the materials used in lamps, such as plastics, metals, electronic components, etc., check whether they contain harmful substances such as lead, mercury, cadmium, hexavalent chromium, etc.
3. Optical performance test
Luminous flux test:Use equipment such as integrating spheres to measure the luminous flux emitted by lamps, that is, the total amount of light emitted by the light source. The unit of luminous flux is lumen (lm), and the test result should conform to the nominal value of the lamp.
Illuminance test:
Use an illuminance meter to measure the illuminance value of the lamp on a certain plane at a specified distance and angle, that is, the luminous flux received per unit area. The unit of illuminance is lux (lx). According to the use scenario and requirements of the lamp, judge whether the illuminance meets the requirements.
Color temperature test:
Use a color temperature meter to measure the color temperature of the light emitted by the lamp. Color temperature is a unit of measurement that indicates the color component contained in the light, and the unit is Kelvin (K). Different color temperatures will give people different visual feelings, such as warm light (low color temperature) giving people a warm and comfortable feeling, while cold light (high color temperature) gives people a bright and refreshing feeling.
Color rendering index test:
Use equipment such as a spectrum analyzer to measure the color rendering ability of lamps for various colors, expressed as the color rendering index (Ra). The higher the color rendering index, the stronger the ability of the lamp to restore the color of the object. Generally, the color rendering index of indoor lighting fixtures should be greater than 80.
Light intensity distribution test:
Use a distribution photometer to measure the light intensity distribution of the lamp at different angles and draw a light intensity distribution curve. The light intensity distribution curve can reflect whether the light distribution of the lamp is uniform and whether it meets the design requirements.
4. Electrical performance test
Voltage and current measurement:Use equipment such as a multimeter to measure the input voltage and current of the lamp under normal working conditions to check whether it is within the rated range. For AC lamps, it is also necessary to check whether their voltage frequency meets the requirements.
Insulation resistance test:
Use an insulation resistance tester to measure the insulation resistance of the lamp to ensure that its insulation performance is good to prevent safety problems such as leakage. Generally, the insulation resistance is required to be greater than a certain value (such as 2MΩ).
Withstand voltage test: Use a withstand voltage tester to apply a certain high voltage (such as 1500V, etc., the specific value depends on the standard) to the electrical part of the lamp for a period of time, and check whether there are breakdown, flashover and other phenomena to verify the electrical insulation strength of the lamp.
5. Environmental and reliability test
Temperature test: For lamps with high heat generation, such as LED lamps, it is necessary to test their heat dissipation performance. After the lamp has been working normally for a period of time, you can use infrared thermometers and other equipment to measure the temperature of key parts of the lamp (such as LED chips, radiators, etc.) to check whether the temperature is within the allowable range.Durability test: Place the lamp under specific environmental conditions (such as high temperature, high humidity, vibration, etc.), work continuously for a certain period of time (such as hundreds of hours or even longer), and then check whether the performance of the lamp has changed, such as luminous flux attenuation, color drift, electrical failure, etc.
Free drop test: For movable lamps or lamps with detachable parts, free drop tests are performed. Drop the lamp from a certain height (such as 1 meter or 2 meters) to hard ground, repeat it several times (such as 3 times or more than 8 times), and check whether the lamp is damaged, deformed, loose, etc.
6. Safety performance test
Grounding test:Check whether the grounding of the lamp is good. Use a grounding resistance tester to measure the grounding resistance of the lamp to ensure that the grounding resistance is less than the specified value (such as 0.1Ω) to ensure that the current can be safely introduced into the earth when an electrical fault occurs.
Anti-electric shock protection test:
Use tools such as test probes to check whether the housing, lampshade, and other parts of the lamp have good anti-electric shock protection measures and whether they can prevent human contact with live parts.
In summary, the detection of LED lighting lamps for bridge guardrails involves many aspects, including appearance and structure inspection, size and material inspection, optical performance test, electrical performance test, environment and reliability test, and safety performance test. These detection methods can ensure the safety, performance, and compliance of the lamps with relevant standards, thereby ensuring the lighting effect and driving safety of the bridge guardrails.