08/06/2022, 10:53
4 Common Questions about Vibration Resistance of LED lights - AGC Lighting
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4 Common Questions about Vibration Resistance of LED lights
Currently, LED lights are used all over the world due to their high efficiency, low power consumption, and long lifespan. Though LED lights
are powerful, their performances are affected by many factors in practical applications. In particular, the harsh environment will reduce the
reliability of LED lights, causing failures. Thus, every LED light must pass several tests, such as thermal shock and rain tests, to meet
relevant standards. IP rating and IK ranting are well known as the measurements of ingress and impact resistance. Vibration also is an
important factor for the reliable performance of LED lights. But it is often ignored. For the applications such as bridges, roadways, loading
docks, and tunnels, vibration resistance of LED lights is critical. This post will show the 4 common questions the answers about the
vibration resistance of LED lights. Hope this post can help you figure out the vibration resistance of LED lights.
Are LED lights sensitive to vibration
It is a myth that LEDs are sensitive to vibration. In fact, LEDs are shock and vibration resistant. Generally, sensitivity of LED lights to
vibration are judged by whether they can function and illuminate normally under the stress of vibration. LEDs are semiconductor devices
comprised by juxtaposing n-type and p-type semiconductor. The current passing through the devices causes electrons and holes to
compound in the devices, resulting in a light output corresponding to the energy to the semiconductor band gap. LEDs are cured on the
brackets with glue, and then connected with circuit board by wires. At last, LEDs are sealed with epoxy to encapsulate and protect the
electronic elements. The solid stage packet and non-filament design make LEDs shock and vibration resistant. Therefore, LEDs are not
afraid of vibration during transportation. It is also easy to install LEDs in any miniature or closed devices. So far, it is not different to
understand LED lights are not sensitive to vibration as well. Since there are no filaments and moving parts, LEDs can emit light normally
under shock and vibration. However, it doesn’t mean LED lights are robust enough to resistant all powerful vibrations, consistent and
strong vibration can damage LED lights over time.
What are the effects of vibration on LED lights
As just noted, Neither LEDs nor LED lights are sensitive to vibration. But LED lights are composed more than LEDs. All electronic
components, fasteners, mounting bracket, and others are affected by vibration. If vibration is beyond the capacity of LED lights, breakouts
and failures may occur. For example, LED lights are mounted on high poles to illuminate roadways or bridges. The combination of strong
and consistent wind and traffic causes severe vibration, which vibrates the poles and threats the stable support of LED lights. Such
vibration may induce serious accident. Back to LED lights themselves, excess vibration can shatter the glass and loose the connections.
Glass is one of the irreducible materials for most LED lights. Diffuser and lens of LED lights are made of glass commonly. Compared to
other components, glass is fragile. As a consequence, vibration can result in cracking glass. To strengthen the resistance to vibration,
tempered glass is selected to manufacture diffuser or lens. Another result of excess vibration is the loose connection. Various
components are wired and connected together inside the LED light. Only with the power supply, can LEDs emit light. The vibration loses
the connection of wires, blocking the power supply to LEDs, and resulting flicker or breakouts.
What are the standards of vibration resistance of LED light
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08/06/2022, 10:53
4 Common Questions about Vibration Resistance of LED lights - AGC Lighting
Various vibration testing standards are applicable to electronic equipment. Some of them concentrate on the electrical safety and
performance. Some of them focus on the minimum capability to perform under different environmental conditions. For lighting, three
standards can be used to judge the vibration resistance of LED light.
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IEC 60598-1
IEC 60598-1 is an international standard that specifies the requirements for the design, construction, and test of electrical luminaires. This
standard requires luminaires to be functional under the stress of vibration. Street lights and floodlights are especially emphasized the
resistance against vibration in this standard. Moreover, the standard also claim that connection between each part of luminaires should
not lose by vibration during normal operation.
IEC 60068-2-6
IEC 60068-2-6 is a testing standard that tests the performance of luminaire with sinusoidal vibration only. Luminaires should function well
within the testing frequency range for a period. The test report states the tested frequency and performance of luminaire. Though
sinusoidal vibration is not common in practical conditions, it allows to us to understand vibration in an easier way.
ANSI C136.31
ANSI C136.31 is an American national standard that specified the minimum capacity to withstand vibration for the roadway and area
luminaires. 3G Test acceleration rating is claimed by ANSI standards. A luminaire passed 3G test means it can withstand the worst-case
vibrations. This standard states that bridge or overpass luminaires are tested at 3.0 G. Luminaires for other places are tested at 1.5 G. Any
loosened parts which can affect the safety and fully function of luminaires is not allowed after the test.
How much vibration can LED lights withstand
In general, mechanical vibration ranged from 0 to 30Hz has a serious effect on LED lights. But it is difficult to calculate the specific
vibration resistance of LED lights. There are many factors that affect the capacity of LED light to withstand vibration. The main factors are
the intensity and regularity of vibrations, the quality of LED lights, the distance from LED lights to vibrations, and the materials of LED
lights. Consistent and powerful vibration induces the potential failures of LED lights. Research showed that the intensity of LED lights
decreased by 25% when they were 34.74 inches away from a 15Hz vibration. But there were no significant effects on the light intensity at
39.74 inches. Long distance mitigates the vibration, and LED lights may perform normally under strong vibration. Vibration may cause
shatter glass and loose connection. If the glass of LED lights are not shatterproof, they are more likely to crack or explode even with low
intensity vibration. Although it is hard to define how much vibration can LED lights withstand, there is no need to worry about the sudden
failures caused by vibration if you select the LED lights corresponding to relevant standards and regulations.
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