The basic verification methods for LED products are: product environmental test verification, product life verification.
1. Product environmental test verification
First of all, we must analyze the life contour of the product we designed. What is the environment that this product may have in the life cycle? What is the user? What is the property of this product? Are there any other special requirements for the product? These factors may affect the specifications of the test in the future, and do not fall into the norm of the process in the process, because a good verification specification is definitely not completely copied from a specification, because even the best specifications can not Simulating the actual environmental needs, it is just a loss, only waste more resources and costs. For example: The designer of LED lamps designed a street lamp for use in the streets of Indonesia and set a verification specification of -40 ° C. It is very happy to do it because the recommended low temperature in the IEC is -40 ° C. However, please recall that Indonesia is located near the equator and has a tropical climate. How can it encounter a temperature of -40 °C when it is hot and humid all year round? Therefore, designing a product for an environment that is never touched will only increase the design cost, because the cost of designing an LED lamp that can withstand -40 °C environment must be higher than the environment designed to withstand 0 °C.
Therefore, please let the product designers return to the fundamentals, and carefully review the products designed by them, in order to achieve an efficient and reliable verification of the actual requirements.
Finally, because the LED products are different from other electronic products, regardless of the reliability before and after verification, the luminescence characteristics must be measured. Generally, the calculus ball or the light distribution curve meter can measure the color of the LED products. Temperature), Luminous flux, Luminous intensity, Chromaticity coordinates, Color rendering, Wave length, etc., as the basis for reliability verification results.
2. Product life verification
In the electronics industry, in order to claim the life of a product, three methods are usually used.
(1) Life Prediction Method (Prediction)
Method: According to MILHDBK217 Part Count and Partstress principles, software is used to calculate the life of the product.
Advantages: short time and low cost
Disadvantages: the result is very different from the actual product life (2) Lifetime measurement method (Demonstration)
Method: Using the Acceleration model, the Acceleration factor was obtained and the actual sample was provided. The sample was measured by an environmental test simulator to obtain the product life. At present, the acceleration model adopts the highest Arrhenius model (high temperature acceleration), Coffin-Manson model (temperature cycle acceleration) and Hallberg-Peck (humidity acceleration).
Advantages: The result is more realistic than the prediction method and the industry is highly accepted.
Disadvantages: higher cost and time-consuming than estimated method
(3) Market return method (Field return)
Method: Recycling the conditions used by product users in the market.
Advantage: the result is equal to the real life
Disadvantages: longer time and cost, difficult to use in the market, usually only the brand field self-preservation
The above three methods for determining the life of the product are adopted by the industry at the most, because it can not only eliminate the shortcomings of the result and the actual difference, but it is obtained through actual measurement, regardless of the high acceptance of both buyers and sellers.
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