What Is the Lifespan of LED Lights?
Introduction
The longevity of LED lighting is one of its key benefits. This is based on the fact that LED lights have been used for decades. We'll explain this based on how LEDs maintain their brightness over time and how long they last when used in LED-related items. While the MW-10W report contains information on LED Wlumen maintenance, the TM-21 may be utilized to determine the LED light's lifetime. In addition, the LxxByy report of LEDs, which includes information regarding the lifetime of LEDs, is now utilized for bids. In this essay, we will inform you about the specifics of the MW-10W, TM-21, and LxxByy reports.
What is MW-10W and how does it work?
The MW-10W report, which is given by the lab in accordance with the IES MW-10W test method and standard, is the lumen maintenance test report of the LED device (LED Package, Array/Module, or COB). The MW-10W report may be used to certify the energy efficiency of finished goods for the US market through programs like ENERGY STAR and DLC.
The LED devices will be evaluated in this article at one current and at least three temperatures (55, 85, and optional). Also, the test will last at least 6,000 hours, therefore the three primary parameters we need take into account for the MW-10W test are test time, LED temperature, and LED current.
MW-10W test procedure
A minimum of 6000 hours should pass during the MW-10W test, which should also be conducted in three different temperatures and, if necessary, with various LED driving currents. Time, temperature, and LED driving current are therefore the three key variables mentioned in the MW-10Wtest.
1. Test duration needed (related to prediction accuracy)
At least 6,000 hours of testing should be done on the MW-10W, and 10,000 hours is ideal. You will learn about LED light attenuation every 1,000 hours by doing this. The shorter the interval period is, the better the accuracy of the forecast time is.
2. Check temperature regulation
Three sets of LEDs will be examined, and the temperature at the Ts point varied for each group. Typical temperature ranges are 55°C and 85°C, with additional temperature range being offered. As an illustration, Lumileds select 105°C as their third temperature.
The typical allowed temperature tolerance during the procedure is -2°C.
It is necessary to keep track of Tair's ambient temperature close to the sample during the test. And it can't be more than 5°C colder than Ts.
3. Current used by LEDs
Typically, the luminous flux attenuation increases with the driving current. Because the manufacturer's design is what determines the LED driving current of LED lights. Some prefer to use low drive current to power the LEDs so the efficacy of LED light is considerably better, while some will use high drive current to achieve high wattage with the same number of LEDs as others. The LED driving current should thus be taken into account when performing the MW-10W test.
The photometric test must be performed at a temperature of 25°C plus 2°C after every 1000 hours of the test period.
Report and test results for theMW-10W
After each 1000-hour test period, we shall receive the results of the photometric test. Results of the photometric test include the highest and minimum normalized flux at each temperature and sample from the beginning for every 1000 hours, as well as the mean, median, standard deviation, and range of the flux. Moreover, any reported chromaticity shift throughout the measurement period should be added.
What should a suitable MW-10W contain?
Test product luminous flux attenuation % and attenuation curve
Product should be tested for color drift, or the variation in color between 6000 hours and 0 hours.
If the report has been approved and complies with the standards for standard testing
If the quantity of samples is sufficient to certify the completed items' energy efficiency.
If the color difference satisfies the required specifications
If the predicted life and the percentage of decay can satisfy the stated demands of the client.
Describe TM-21.
How is the lifespan of an LED light determined?
At the moment, LED packaging goods use it as their primary approach for life assessment. With this way, the final LED light may assert its lifespan L70*.
*L70 is the period of time during which an LED light's lumen output retains 70% of its initial lumen output.
In other words, an LED light with a L70 rating of beyond 50,000 hours would still be producing 70% of the light it did at 50,000 hours. The output of an LED light with a L70>100,000 rating will still be 70% after 100,000 hours. The lifespan of this LED light is above 100,000 hours, we will then claim. We believe it's time to replace it with a new one when the lumen output is less than 70% of the initial flux.
Tests are done on the driving current of the LEDs and the temperature of the corresponding point (Ts) when the LED device is attached to the final LED light.
If the conditions described in the MW-10W report are more severe than those in the LED light's temperature and current, the data in theMW-10Wreport can be used instead. The TM-21 table is also available for download at www.energystar.gov. Moreover, the MW-10W should be utilized together with this form.
Consider the 100W Rifle series LED Street Light as an illustration.
The LM80 result (red column) needs to be added to the TM21 table. The TM21 tables 1 through 3 will be obtained at 60 mA, 70 °C, 85 °C, and 105 °C, 100 mA, and 200 mA, respectively.
Given that the LED driving current is 68 and the ZGSM-ST17-100Ts M's is 60.5°C, the data in TM21 table 2 may be completed. due to the fact that table 2's Ts and drive current are more severe than those of the ZGSM-ST17-100M.
The lumen maintenance rate is displayed in the pink column.
These are the outcomes.
The lumen maintenance rate is 74.19% after 100000 hours.
We can vouch for the L70>102,000hrs of our rifle series.
Yet, the outcome will be different if the Ts is 90°C but the others are all the same. Since the conclusion is based on curves at both 85°C and 105°C.
Summary
We can see that these three MB-10W studies are concerned with the lifespan of LEDs and that this lifespan is mostly influenced by temperature and driving current. In order to maximize the service life of the LED lamps, we have tight standards for the temperature of the lamps and the driving current of the LEDs for our products, which include LED street lights, flood lights, high bay lights, and gas station lights.
