The lengthy average lifespan of LEDs may have drawn your attention. Well, who wouldn't want something with that kind of longevity? By reducing the need to buy and install replacements, having that type of lighting solution can free up more time and funds for the things you truly enjoy. But what is the lifespan of LED strip lights? How can one measure their average lifespan?
The lifespan of LED strip lights and the L70 metric
LEDs age differently than fluorescent and incandescent bulbs, which eventually flicker and burn out. There is a gradual reduction in light output rather than a total darkness. You can anticipate that your LEDs' lifespan will come to an end whenever they become too dim to use, given the frequent failures brought on by power surges and mechanical damage.
How dim is too dim, even though it might cross your mind? That question has many different answers, and you can approach it using the L70 metric or your own preferences. You will most likely discard your LEDs before they reach the designated disposal rate or after the recommended switchover if you discovered it on your likes and dislikes.
Nonetheless, 30% of lumens loss or 70% of light remaining should be the end of the line if you base it on the L70 metric. The amount of hours it would take for an LED to reduce to just 70% of its initial light output is known as the L70 measure.
L70 Calculation in Metrics
The lifespan of LEDs is influenced by a number of parameters, including material, quality, and durability. Higher driving currents and temperatures, however, generally lead to a quicker drop in light output. The LM-80 advises testing sample specimens at a predefined temperature and current drive, with light output change measurement at 1000-hour intervals at 10,000 hours, due to the large and varied variety of materials among different LED types and manufacturers.
To ensure accuracy and fairness, the LM-80 test is usually conducted by a third-party laboratory, and the results are reported in a report format. This test is performed on LEDs by all respectable manufacturers, and a genuine LED provider should have no trouble demonstrating it to you, particularly if you're purchasing in large quantities!
The lifespan test of LEDs is difficult since it takes a very long period. The 10,000-hour test will take about 14 months to finish, even if the LED is on all the time! In a field that moves quickly, like LED lighting, this is forever. Six years of continuous testing are required to test a fitting to the full 50,000-hour promise.
The LM-80 test is not yielding results as quickly, hence TM-21, an exploration algorithm, was created. Over the first several thousand hours, the procedure absorbs the data from the LM-80 samples. After that, it generates an expected lifespan number, which is what you see on warranties and specifications documents.
Three Reasons LED Lifetime Estimates Could Be Wrong
There are a number of prerequisites and parameters for longevity rates in both the LM-80 test and the TM-21 method. Your LED supplier's lifetime claim may not be true if they did not follow these guidelines.
Only six times as many hours as were actually tested may be declared. Therefore, even if the LED under test operated flawlessly, the maximum extended lifespan claim based on the data gathered could only be 30,000 hours if the LM-80 test result was only up to 5,000 hours. This is to ensure that hasty judgments are not drawn from incomplete data.
For the LM-80 test, the drive current and case temperature need to be higher than those for the LED strip. As previously stated, the two variables that affect an LED's lifespan are temperature and drive current. The real-world use cases may surpass the LM-80 test if your LED strip can tolerate a greater drive current and temperature. The initial lifespan forecast would therefore be overestimated.
The TM-21 and LM-80 tests are not flawless. The test process does not account for additional variables, such as humidity and volatile organic compounds (VOCs) included in the potting compound for waterproof strip lights. Using the same LM-80 test report, there are also some rules about what materials can be used in place of others in an LED's design. You never know-manufacturers might employ less expensive materials for production and better materials for test samples.
Over time, LED strips change color
Some LED strips change color over time in addition to losing brightness. The color shift is seen in the LM-80 test report, however it is not mentioned in the technical specifications. Finding any documentation of the acceptable shift level for both your own usage and the industry as a whole is difficult.
You can better understand color stability by looking at the metric known as "delta u'v." Just remember that the human eye perceives anything greater than 0.003 as conspicuous. You will therefore require the LM-80 test report or the "delta u'v" if you are extremely picky about this.
For many indoor applications, a delta u'v of less than 0.006 is generally considered acceptable for the LED strip's lifetime. However, for more specialized installations, such as lighting artworks in museums, it is essential to select a fixture with superior color stability.
Additional Factors Affecting the Lifespan of an LED Strip
Even while LED chips are essential to the longevity of an LED strip light, other factors can compromise it! The lifespan of an LED strip can be shortened by the power source and the adhesive backing. If your strips don't have a sturdy backing and keep falling off the surface you fastened them to, the continuous impact could harm the LEDs.
If the power source fails, your strips will go dark right away, so don't expect them to dim over time! Therefore, you must make sure that there are other high-performance and long-lasting options outside your strip lights. For them to function, the power supply must likewise be of the highest caliber!
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