The Environmental Protection Agency (EPA) and the Department of Energy (DOE) have successively released Energy Star? And LighTIng Facts standards for LED light source lamps / bulbs since 2010. LED lighting product specifications have been followed, and the current international LED manufacturers have based on the life assessment and product specifications of LED products. In other words, if LED manufacturers want to enter the international LED lighting market, they must obtain the LED Energy Star certification ticket. In the ENERGY STAR section, on July 6, 2011, in order to simplify the qualification review process, the EPA specifically integrated the two large-scale lamp specifications for residential lighting (RLF) and solid-state lighting (SSL Luminaires) into [ENERGY STAR? Luminaires Program Requirement V1.1], and it is scheduled to be officially implemented on April 1, 2012. In addition, the bulb part will also be integrated into [ENERGY STAR? Program Requirements for Integral LED Lamps V1.4], in addition to the increase in audited data items in the two specifications, it should be the requirements of [LM-82 Photoelectric Characteristics Specification] and [TM-21 Life Prediction Specification] Has been included. LM-82 is currently not officially published by the North American Lighting Association (IESNA). Its content is mainly the characteristics verification method of the electrical and optical characteristics of LED Light Engines and Integrated LED Lamps at different temperatures. The measurement method is similar to LM-79 -08 plan, but the focus is on the evaluation of the influence of temperature on the characteristics of electrical / optical parameters. The other part is TM-21-11 (ProjecTIng Long Term Lumen Maintenance of LED Light Sources) published by IESNA on July 25, 2011. This specification is mainly for the prediction of LED light source performance and life, and the LM-80-08 LED lumen maintenance rate experiment is connected, and the experimental data of LM-80-08 is used to estimate the long-term life performance of LED components and lamps / bulbs. 1. Using TM-21 to estimate the lifespan of LED lamps To make LED manufacturers have a clearer concept of TM-21 and understand how to make good use of TM-21 to estimate LED products, I will explain LM-80 in four procedures Application and estimation methods of 08 and TM-21-11: Step 1: The LED component supplier conducts LM-80-08 experiment with at least 6,000 hours of 3 temperatures (55 ° C / 85 ° C / optional temperature) for its LED Source (Package / Array / Module). ★ Number of samples required: (related to the estimated time) ★ Test time requirements: (connected to the estimation accuracy) At least 6,000 hours, 10,000 hours is recommended, the test LED light attenuation data needs to be obtained every 1,000 hours, the shorter the interval time (such as: 500 hours) can improve the accuracy of estimation. Step 2 : Estimate the long-term life data of 3 test temperatures (55 ℃ / 85 ℃ / optional temperature) according to TM-21-11 formula. ★ Obtain the average value of the experimental data of each temperature, the test data extraction time rule is: ★ Obtain the slope with ExponTIal Least Squares Curve-Fit m (Slope) and intercept b (Intercept). When calculating m and b, the longer the test time is, the denser the interval will be. The accuracy will be improved. Then calculate the B and α values. ★ Calculate the life time value of the LED in each temperature experiment at the lumen maintenance rate of 70% specified by ENERGY STAR according to the following formula. L70: Use time when the LED lumen maintenance rate is 70% ★ Use the number of samples in Step 1 to make a standard judgment of the estimated multiple times: The representation is: (6K): LM-80 test time, (6K) = 6,000 hours; (10K) = 10,000 hours XX, XXX Hours: sample ≧ 20ea, test time = 6,000, it can be estimated that 6 times is 36,000 hours ★ Use the Exponential formula to calculate the lumen maintenance rate at each time, then the calculated data can be used to plot the estimated life curve of each test temperature: Step 3: Obtain the In Situ Temperature of the LED component placed on the LED lamp. ★ Please refer to the ISTMT (In Situ Temperature Measurement Test) test procedure to obtain the temperature of the LED component placed in the LED lamp. The test temperature position must be the same as the LM-80-08 Ts setting position. The temperature data taken out is called TMPLED ( LED Temperature Measurement Point). Step 4: Interpolate the calculated TMPLED and TM-21 calculation results to obtain the estimated lifetime value of TMPLED. ★ From the three test temperature points, select the two closest temperature points of coated TMPLED as the calculation reference point. ★ Calculate Arrhenius ModEL temperature acceleration parameter A and get Decay Rate: α and fixed value parameter B0. ★ Use the above formula to calculate the L70 value of TMPLED. The same procedure shows the result of TMPLED. ★ Set the relevant time value and draw a life estimation chart of TMPLED and three Ts. 2. ENERGY STAR / Lighting Facts' life requirements for LED lamps / bulbs There are only two specifications for ENERGY STAR lamps. Lamp manufacturers can use the entire lamp to light 6,000 Hrs., Or submit the 6,000 Hrs LM-80 report from component manufacturers and TM-21 estimation results to confirm the lumen maintenance rate of the finished lamp. In the light bulb part, the standard is more flexible, and the standard will be fine-tuned for different uses, as shown in the following table: 3. The key to the highly competitive LED lighting competition: LED quality Lighting products are regarded as the biggest business opportunities for LEDs. However, LED prices have been too high in the past. Although they have the advantages of power saving and environmental protection, the price still cannot compete with incandescent and power saving bulbs. In addition, due to the lack of relevant quality verification standards in the past few years, the uneven quality of LEDs (light decay problems, color change problems, etc.) has also led to many negative use experiences, and also caused the delay in the growth of LED lighting usage. However, in 2012, the sweet spot of the price of LED lighting has arrived early, and it is expected that the demand for LED will significantly increase in the next two years. When the price of LED products reaches the price acceptable to consumers, whether LED manufacturers can stand out from the crowd at this time of rising demand, and the key to winning by consumers is the quality and life of LEDs. Therefore, finding a professional laboratory to provide assistance is definitely one of the fastest ways to improve quality and market competitiveness. Linear Dc Power Supply,Linear Bench Power Supply,Adjustable Linear Power Supply,Variable Linear Dc Power Supply Yangzhou IdealTek Electronics Co., Ltd. , https://www.idealtekpower.com
