In recent years, with the continuous development of the LED technology, high power semiconductor lighting devices in the rapid development in recent years, especially the white light power and efficacy continuously improve, LED gradually entered the lighting field, caused a new lighting technology revolution. LED by different ways permutation and combination and optical design, form a wide variety of 200W led floodlighting products, and 200W led floodlighting products research and development in our country is being carried out, the 200W led floodlighting products performance level also gradually improve. The correct test method in the premise of accurate measurement of 200W led floodlighting products photoelectric color performance parameters is a scientific evaluation of product performance, quality present situation and development trend of the foundation. According to the 200W led flood lighting products photoelectric color performance testing situation, where the author center in the testing work of the LED products, 200W led flood lighting products for accumulation of photoelectric color performance detection method combing and summarized.
A, the 200W led floodlighting product performance of the general evaluation
1. The classification of 200W led floodlighting products At present, the 200W led floodlighting products mainly can be divided into the 200W led floodlighting lamps and lanterns (such as: LED road lamps, LED cast light lamps and lanterns, embedded LED lamps, the LED tunnel lamps, LED decorative lighting, LED desk lamp) and traditional lighting light source substitutes LED lamp (such as: from ballast LED lamp, MR16, PAR lamp, straight tube shape LED fluorescent lamp members &people waiting/T12, etc.). 200W led floodlighting lamps and lanterns is including based on 200W led flood lighting components and matching drive with optical components, fixed and protection of the luminous element components and instruments will be connected to the branch circuit component complete lighting appliances. Lighting LED lamp and can be divided into the integral 200W led flood lights and integral LED lamp two . The integral LED lamp contains LED array (module) or LED packaging (element) and standard lamp holder and other optical, thermal, mechanical and electrical element component. This LED lamp should be installed in a standard lamp holder and LED driver used in lamps and lanterns. The 200W led Flood light can't directly with the branch circuit connection. Monolithic LED lamp contains LED array (module) or LED packaging (element), LED driver, standard lamp holder and other optical, thermal, mechanical and electrical components of the whole combination. The 200W led Flood light can be installed directly on a standardized base on use, it can directly with the branch circuit connection. 200W led floodlights and 200W led floodlighting lamps and lanterns is the biggest difference between LED lamp should be installed in standard lamp holder in use.
2. 200W led floodlighting lamps and lanterns and the traditional light source of lamps and lanterns differences At present, the 200W led flood lighting lamps and lanterns and the traditional light source in many aspects of lamps and lanterns there are different. First of all, the traditional source of lamps and lanterns life can through the replacement of damaged light source, light control devices to meet the requirements, so don't usually evaluation traditional light life. 200W led floodlighting lamps and lanterns is 200W led Flood light source and lamps and lanterns shell one, at present, the 200W led floodlighting lamps and lanterns of the life and 200W led Flood light source itself life, LED driver and LED lamps and lanterns to provide the environment, and many other factors. To different LED lamps and lanterns, the life only through relevant life characteristic evaluation to determine. Secondly, with the traditional light source, 200W led floodlighting lamps and lanterns different lamps and lanterns is the use of multiple 200W led Flood light source or module of illuminant and luminous, LED lamps and lanterns of light between the color difference, need to use color space uniformity evaluation to evaluate LED lamps and lanterns color space distribution, evaluation LED lamps and lanterns are different observation Angle color difference. Again, the traditional lighting light source can be separately photometric test, photometric measurement can use relative method. Due to the LED lamps and lanterns integration and 200W led Flood light source of temperature sensitive characteristic, is not suitable for the 200W led Flood light from within the lamps and lanterns of isolated single measurement, photometric measurement should use absolute method of LED lamps and lanterns whole photometric test. Fourth, the traditional lighting lamps and lanterns to evaluate efficiency with lamps and lanterns, and LED lamps and lanterns USES energy efficiency or efficacy to evaluation.
3. 200W led floodlighting product performance of the general evaluation
Lighting product performance of the general evaluation content mainly includes: the light characteristic; The electrical characteristics, color characteristics, thermal properties, life characteristics, reliability, etc. At present evaluation 200W led floodlighting product performance indicators mainly include the following aspects:
(1) light characteristic mainly includes: the light intensity distribution, initial output efficiency (efficacy)/light, light intensity/illumination;
(2) the electrical characteristics include: lamp power, power factor,
(3) color characteristic mainly includes: correlated color temperature, color rendering index, chromaticity coordinates, chroma tolerance, dominant wavelength (color), color distribution inhomogeneity and color space uniformity;
(4) thermal properties including thermal resistance and junction temperature; (5) life characteristics including switch frequency test, life/accelerated life test, lumen maintenance ratio (light maintenance ratio)/intensity of light maintenance ratio (reflective cup type MR16 or PAR light);
(6) reliability test.
Second, the 200W led floodlighting products photoelectric color performance test methods Because at present about 200W led flood lighting products, thermal characteristics of the life characteristics and the reliability of the relevant standards are discussion and drafting, so this paper mainly discussed the 200W led floodlighting products photoelectric color performance test methods. The 200W led flood lighting lamps and lanterns points and LED lamp two series to discuss.
1. 200W led flood lighting products test environment and physical conditions
200W led floodlighting products tend to have optical component, so a relatively clean environment storage and test, the product on the lens to clean no fingerprint. Test environment can not have too much vibration and impact, reduce air convection. Due to the 200W led floodlighting product performance parameters on the temperature sensitive, in test environment air temperature and humidity should satisfy the corresponding standard specified in the environmental requirements. The environment temperature is 25 ℃ ± 1 ℃ (switch life test for 5 ℃ ± 5 ℃) maximum relative humidity is 65%, LiuFeng lack. Product work attitude should according to the provisions of the manufacturers work attitude or actual use attitude, in order to avoid improper work attitude affect heat dissipation, affect photoelectric parameters. 200W led floodlighting products need long enough to achieve temperature balance. General LED lamp is stable 30 minutes, large 200W led floodlighting lamps and lanterns should be more than 2 hours to temperature balance. Temperature balance judgment principle: 15 minutes illumination change less than 0.5% can think reached the temperature balance. 2. 200W led floodlighting lamps and lanterns of photoelectric color performance testing 200W led floodlighting lamps and lanterns of photoelectric color performance parameters including: lamps and lanterns total power, power factor, light intensity distribution, lamps and lanterns, total output light output efficacy, lumen maintenance ratio/light maintenance ratio, correlated color temperature, color rendering index, color tolerance, color coordinate, chromatic space is not uniformity.
(1) at the same time with distribution spectrum radiometer distribution photometer by a measurement almost can get all the performance parameters of the results. Distribution spectrum radiometer main test lamps and lanterns color characteristics and color space distribution, distribution photometer main test light distribution, the parameters such as light. Distribution photometer test principle can be reference standard GB/T 9468-2008 "lamps and lanterns distribution photometric general requirements".
(2) at present a lot of testing institutions light characteristic parameters (light distribution, light) and color characteristic parameters are respectively with distribution photometer and integrating sphere system measured data. All use distribution photometer test lamps and lanterns, lamps and lanterns clamp installed make sure LED lamps and lanterns light center and mechanical shaft center coincidence, at the same time try to make lamps and lanterns in working attitude. In integrating sphere system test color characteristic, lamps and lanterns doesn't have to be in integrating sphere center position.
(3) LED lamps and lanterns light of usable also integrating sphere system to measure, the ideal state is LED lamps and lanterns in integrating sphere top, and make all the output light into integral in the ball, and can also measure the color of lamps and lanterns parameters. Existing integrating sphere open position in most profile, therefore I have special purchasing the blue fe company rotary 2 meters integrating sphere system used in 200W led floodlighting products of light color detection. Integrating sphere 2 p open can according to need to stop at any position, so as to realize the sample to be tested at any position measurement, meet the energy star LM - 79 test requirements. Detection mechanism for LED lamps and lanterns of photoelectric color performance testing mainly adopts the above (1) and (2) two modes. Use distributed photometer measuring the greatest of faults is to test time is too long, the test efficiency is too low.
3. LED lamp photoelectric color performance testing LED lamp photoelectric color performance parameters including: lamp power, power factor, light, output efficacy, light maintenance ratio, correlated color temperature, color rendering index, chroma tolerance, color coordinates and reflective cup type MR16 or PAR light beam Angle, light intensity and light strong maintain rate, etc.
(1) with auxiliary light of integrating sphere system can quickly measure 200W led floodlights all the photoelectric color performance parameters. First the LED lamp in integrating sphere center, the 200W led Flood light does not light to be measured under the condition of light with the auxiliary lamp test a. Put out auxiliary light and light measured LED lamp, stable after the test time, get measured light color characteristic parameters, and through the software automatic computation get measured LED lamp light. If not in integrating sphere with auxiliary lamp, LED lamp body itself can absorb part of the reflected light, light value will be some error. At the same time, integrating sphere wall should also be with high reflectivity: 90% ~ 98%. At present most of the testing institutions within the integrating sphere system without auxiliary light, integrating sphere wall reflectivity less than 90%, the integrating sphere system can't accurate measurement of LED lamp light.
(2) LED lamp light can also be used to measure the distribution photometer, test γ Angle range to choose 180 °, light center and mechanical shaft center coincidence. Defect is testing time is too long.
(3) reflective cup type MR16 or PAR light beam Angle, light intensity can be through the small bedroom distribution photometer to measure. Test, mechanical shaft and axis should be consistent. Defect is test attitude for abnormal working condition, the result of the test to make correction. Three, the summary
200W led floodlighting products photoelectric color performance parameters measurement can use distribution photometer or integrating sphere system measurement, also can use collocation. The specific method for choice which depends on the amount of measurement (color characteristics, light characteristics), product size and other request. On the whole, with the auxiliary light of integrating sphere system suitable for measuring integration 200W led floodlights and relatively small size LED lamps and lanterns light characteristics and color characteristic parameters. Integrating sphere system of the advantages of this test is measuring fast, and you don't need to dark room. Distribution photometer provides light intensity distribution and the total light measurement method, which can measure relatively large 200W led floodlighting products, of course, can also be used to measure small size 200W led floodlighting products. Pay attention to test environment requirements, air flow is sensitive to temperature may affect the measurement of 200W led floodlighting products. Use distribution photometer method should pay attention to the right holder loading location. Installed in distribution photometer on high precision spectrum radiometer don't after the mirror reflection to the direct measurement of color space distribution. Compared with integrating sphere, with distribution photometer measurement is time-consuming. In the right test method premise, through the reasonable selection test method to achieve accurate measurement 200W led floodlighting products of photoelectric color performance parameters for scientific evaluation, 200W led floodlighting product performance quality present situation and development trend to provide data suppor