Testing & Certification
3G Vibration Test
Luminaire
Vibration Test
The luminaire vibration test is designed to determine whether the luminaire is
able to withstand vibrationconditions that may be encountered in normal
installations. The test is a mechanical performance evaluation. Therefore, the
luminaire is not normally energized d uring the test. A lamp shall be installed
in the luminaire for this test. The test criteria were developed with consideration
to the effect of wind and traffic induced vibration.
The luminaire shall be attached as it would be mounted in the field to a
vibration table capable of withstanding the loads and forces encountered during
the test and tested in a manner to simulate a normal installation.
The luminaire shall be vibrated at or near fundamental resonant frequency. This
frequency shall be determined for each of the three mutually perpendicular
planes (x, y, and z) and should be between 2 and 30 hertz. The acceleration
intensity measured at the luminaire’s center of gravity shall be as specified
in the corresponding levels as shown below. Level 1 should be used for normal
roadway applications. Level 2 should be used for bridge and overpass
applications. If the luminaire housing utilizes several different materials in
its construction, the worst case criteria from the tables shall be used in the
testing. During the vibration test, the frequency and displacement should be
monitored. A major change in frequency or displacement is an indication of
structural failure. The luminaire shall be capable of withstanding the described
vibration for 100,000 cycles in each plane. A separate sample luminaire may be
used for each plane to eliminate the effect of conjunctive material fatigue.
Other test amplitudes and durations may be negotiated between the specifier and
supplier as needed to simulate extreme fatigue. At the test conclusion, the
luminaire shall meet its original specification. There shall be no damage to
the enclosure, reduction of electrical spacings, or loosening of any part of
the luminaire. If the light source is integral to the luminaire, it shall be
fully operational at test completion.
Vibration Test Level 1—Normal Applications
All materials shall be 1.5 G (14.67 m/s2)
Vibration Test Level 2—Bridge/Overpass Applications
All materials shall be 3.0 G (29.4 m/s2)
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