Rapid LED illumination product service life and reliability evaluation

Abstract

The invention relates to a rapid LED illumination product service life and reliability evaluation method. The method comprises steps that 1), a test sample is divided into multiple groups, and initialluminous fluxes and color coordinates of the samples are measured; 2), different temperature and humidity combination stresses are employed, and an acceleration experiment of each group of sample iscarried out; 3), a luminous flux and a color coordinate of each group of sample are respectively measured at multiple time segments, and lumen maintenance and color drift are calculated; 4), lumen maintenance degeneration data fitting and color drift data fitting are carried out to acquire a lumen maintenance degeneration locus equation and a color drift degeneration locus equation; 5) a lumen maintenance failure threshold and a color drift failure threshold are determined; and 6), lumen maintenance service life and color drift service life of LED illumination products under normal work conditions are respectively acquired according to the degeneration locus equations and a temperature-humidity Weibull model. The method is advantaged in that the test time is shortened to 1000 hours on thecondition that service life evaluation precision is not influenced, and product service life and reliability can be truly reflected.

Description

technical field [0001] The invention relates to the field of performance testing of LED lighting products, in particular to a method for rapidly evaluating the service life and reliability of LED lighting products. Background technique [0002] As a new type of lighting technology, LED has a very broad application prospect, especially high-brightness LED is known as the most valuable light source in the 21st century, which will surely cause a new revolution in the field of lighting. LED light sources have incomparable advantages over other traditional light sources, both in terms of luminous principles and functions. Therefore, LED lighting has become the development trend in the field of lighting in the 21st century. [0003] my country's Green Lighting Project Promotion Project Office has conducted a survey. my country's lighting power consumption is more than 300 billion kWh per year. If LEDs are used to replace all incandescent lamps or partially replace fluorescent lam...

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Problems solved by technology

[0034] (4) The life test time of LED lighting products is too long, and the life fitting model is too simple

[0036] IES TM-28 uses an exponential model to fit the lumen maintenance data of LED lighting products. The exponential model is suitable for situations where the failure rate is constant. For LED lighting products, the failure rate is not necessarily a constant value, so the exponential model is used Models can produce errors in lifetime estimates

[0037] (5) Excessive test stress is used in some occasions to speed up the test process

[0039] (6) The life and reliability of LED lighting products, as well as the confidence interval for life and reliability cannot be given

The current life testing standards for LED lighting products only give a method to verify whether the product life can reach a certain value (such as 25,000 hours), but cannot give the specific value and confidence interval of the product life, resulting in the possibility of different designs of products. Both meet the life requirements (such as 25,000 hours), but no further comparison can be made between which one is better

In addition, there is currently no testing standard for reliability indicators of LED lighting products

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