The LED lighting products photoelectric colour performance test methods

The LED lighting products photoelectric colour performance test methods

Because at present about LED lighting products thermal characteristics of the characteristics and reliability, service life of the relevant standards are seminars and drafting, so this paper mainly discussed the LED lighting products photoelectric colour performance test methods. LED lighting lamps and lanterns below points and LED lights two series to discuss.

1. LED lighting products test environment and physical conditions

LED lighting products tend to have optical components, so a relatively clean environment, storage and test products to clean impression of the hand. No lens Test environment can't have excessive vibration and impact, reduce air convection. Because of LED lighting products performance parameters is sensitive to temperature, in trials environment air temperature and humidity should meet the corresponding standards of environmental requirements. The environment temperature ¡À 1 ¡æ 25 ¡æ (switch life test for 5 ¡æ ¡À 5 ¡æ) is 65%, the biggest relative humidity LiuFeng lack. Products in accordance with the manufacturer of the regulations shall be gesture work attitude or actual use, in order to avoid improper attitude of work attitude, then affects the photoelectric effect thermal parameters. LED lighting products need to be long enough to temperature balance. General LED lamp is stable 30 minutes, large LED lighting lamps and lanterns to more than 2 hours to temperature balance. The judgment of the temperature balance principle: 15 minutes intensity of illumination change to less than 0.5% can think temperature balance.

2. The LED lighting lamps and lanterns photoelectric colour performance testing

LED lighting lamps and lanterns photoelectric colour performance of main parameters including: lamps and lanterns total power, power factor, light intensity distribution, total output flux, lamps and lanterns lumen output photosynthetic efficiency, maintain rate/flux maintenance ratio, relevant color temperature, the colour developing index, color tolerance, color coordinates, color product space not uniformity.

(1) in with have distribution spectrum radiometer on the distribution of a measuring absorbance by almost all available performance parameters of the results. Distribution spectrum radiometer main test the color of lamps and lanterns characteristics and color space distribution of the main test indicates distribution parameters such as light distribution, flux. Distribution of the test principle can be digested reference standard GB/T 9468 2008 "lamps and lanterns is the general requirements of luminosity distribution measurement".

(2) many test organization light characteristic parameters (light distribution, flux) and color characteristic parameters is respectively with distribution and integral photometric data obtained by the system. All use distribution test when lamps and lanterns, lamps and lanterns photometric nipped make sure LED lamps and lanterns light center and mechanical axle center, and try to make lamps and lanterns coincide in working attitude. In the points system test color characteristic ball, lamps and lanterns doesn't have to be in the center position integral.

(3) LED lamps and lanterns of the flux can also be used to measure the system integration, ideally will LED lamps and lanterns in integral ball, and to make the top all output light into points within the ball, and can also measure the color of lamps and lanterns parameters. At present the existing integral ball open position in most profile, therefore I have special purchasing the blue of the Philippines company rotary 2 meters integral ball system used in the light of LED lighting products color examination. Integral ball 2 p openings may, according to needs in any position to stop, so as to realize the samples to be tested in any position, meet the measurement of the energy star LM 79 test requirement.

Detection institutions LED lamps and lanterns for the photoelectric colour performance measure the main with the above (1), (2) two patterns. With distributed measuring absorbance biggest drawback is testing time is too long, test efficiency is too low. 3. LED lamp photoelectric colour performance testing

LED lamp photoelectric colour performance parameters including: main lamp power, power factor, flux, output photosynthetic efficiency, flux maintenance ratio, relevant color temperature, the colour developing index, color product tolerance, color coordinates and reflective cup type MR16 or PAR lamp light intensity and light beam Angle, strong maintenance ratio, etc.

(1) with auxiliary lights points system can be fast ball measured the LED lights all these photoelectric color performance parameters. First the LED lamp in integral ball center, in LED light does not light being measured under the light of the auxiliary lights a. Test Put out the lamp and light measured by auxiliary LED lamp, stable again after a test, get tested the color of the light, and the characteristic parameters are calculated by the software automatically tested LED lamp of the flux. If the ball is not in integral with auxiliary lights, LED lights body itself will absorb part reflected light, flux values will be some errors. At the same time integral ball wall should have high reflectivity: 90% ~ 98%. Now most of the testing of the agency within the integral system without the ball, auxiliary lights integral ball wall is lower than 90%, the reflectivity integral ball system can't accurate measurement of the flux LED lights.

(2) LED lamp of the flux distribution can also be used to measure, test indicates when ¦Ã Angle range should choose 180 ¡ã, the light center and mechanical axle center overlap. Defect is testing time is too long.

(3) reflective cup type MR16 or PAR lamp light intensity Angle, can beam through small bedroom photometric to measure the distribution. Test, mechanical axis and the optical axis should be consistent. Defect is testing for abnormal posture work of the state, the result of the test to make correction

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