Why the underground lamp with a rated
IP67 waterproof level is still leaking?
Many of us may wonder that the rated IP67
outdoor underground lights are with water or moisture infiltrating into the
internal of the lighting fixture, even though these IP67 LED in-ground luminaires
are with IP test reports issued by the Third-party certification bodies which
prove these luminaires are passed IP67 tested and IP67 waterproof level. And
some of these lights are world well-known international brands which are still
leaks or with moisture Attached to the inner of glass cover of underground lights.
Why the underground lights with a rated
IP67 waterproof level is still infiltrated with water or vapor?
Before having the answer, it is better to
understand and learn what IP67 meanings. IP67 means the ingress of water in
harmful quantity shall not be possible when the enclosure is immersed in water
under defined conditions of pressure and time (up to 1 m of submersion). For
more information about ingress protection, please view this link>> What
is IP code and IK Code?
The reasons for the water leakage or
moisture problem of underground lights are main 4 aspects:
1. Unreasonable design
2. Defects in materials
3. Defects in workmanship
4. Improper installation and operation
1. Unreasonable Design
For example, some outdoor underground lamps
are sealed with glue to prevent the water from seeping in. These lamps sealed
with glue meet the waterproof IP grade indeed when they finished and tested in the
factory, or even still working excellent in Third-party certification bodies or
lab.
However, the glue will start to get age and turn yellow after about a period of time (around 6 months) of use in an outdoor harsh environment, and the vapor or water will infiltrate to the inner of lamp housing. Therefore, glue sealing waterproofing is unreliable or not enough, the structural waterproofing for outdoor lighting is the kingly way for underground lights, or it is better adopts both structural waterproofing and glue sealing waterproofing technology, especially for IP68 LED underwater lights.
The front cover of some underground lights ere
not be pressed firmly or properply, and the manufacturer did not fix the front cover and
housing firmly by enough screws. It should be known that LED buried lights are
often in an environment immersed by water, and if the front cover is not fixed
on lamp body tightly and properly, it is easy to lead to the water or vapor seep into the
internal of the underground lighting fixtures via the gaps.
There are only 2 or 3 screws for the front
cover for such a large size lamp, and the distance between the screws is far.
Do you think it is pressed and fixed tightly?
If the cover of the lamp is not pressed and
fixed firmly, there may be gaps, and it is hard to be waterproof even if it is
filled and sealed with glue.
The lamp of an international brand in the
picture below has no glue sealing inside. Let's check how many screws are used on
it? 10 pcs screws.
Several of the lamps mentioned above are
not easy to pass the IP67 test. And even if it passes the IP67 grade test, it
does not mean there will be no risk of water leakage. Structural design defects
in lamps can also lead to water leakage.
Some manufacturers perform a soak-in water
test for their underground lamps under certain temperature conditions, BUT
there is a risk of failure if the test time is too short (such as 5~6 hours) and
considered their lamps passed the IP67 testing. But the fact is, the environment
of outdoor lamps is complex in the actual working process than the simple
testing.
When the fixture is turned on or working under
the scorching sun, the inside temperature will increase as the operating time
goes. Conversely when the lamp stops working or when it is raining or snow, the
temperature will slowly drop. This phenomenon will cause “The Siphon effect”.
Thermal expansion and contraction make the inside and outside air pressure
differences. The vapor will infiltrate to the housing through the wire entry as
soon as the internal air pressure is smaller than the external.
This is caused by the unreasonable
structure design of the lamps or improper operation for the connection for the
lamp, which leads to the substandard durability of the lamps.
2. Defects in materials
Defects in the material of the luminaire
may cause the luminaire to leak.
This is related to the key waterproof materials
of the lamps, such as, waterproof nuts, sealants, silicon rings, etc., which
often perform well when they are first installed, but their durability is not
enough after a long time. The Poor quality silicone rings will get age in two
months. And the outdoor underground light is often exposed to the sun, the ring
will crack and water will go into the internal of the housing via the gaps. And
lead to premature failure for the outdoor underground light which is not
reaching the designed life as expectation.
Even if the silicone ring is not aged, if
the silicone strip is not selected properly, and if the selected silicone ring
for underground lamp is not an inorganic material but an organic material, It
may be acted and decomposed by mildew which the underground light is result in leaking water.
Therefore,
the correct selection and high quality of materials is also very important for
outdoor LED underground lights.
3. Defects in workmanship
For example, the front cover or the bottom
cover or other cover for the underground light must be very dense and fixed firmly
by screws when the lamp is assembled. Each screw has its fixed torque, if screws
are driven too tight, the silicone ring will be crushed, if the screws are driven
too loose, the silicone ring is not tight enough. That is to say there will be
a fixed torque for the screws.
Companies with quality assurance have
designed the torque for screws, which can be in place in a good position with
just a hit of the electric drill. Other companies without design and conditions
to design the torque, just screwed it casually during assembly, it’s hard to avoid
water leakage issues.
Well, what if it is a well-known
international brand, the lighting design is reasonable, and the materials are
good quality, does the IP67 underground lamp will not with the leaking water
issue?
The answer is NO!
If the in-ground lamp you use is from a
famous supplier or qualified suppliers, but it still gets water leakage, the
only possibility is improper installation methods.
4. Improper installation and operation
① Installation ground surface is uneven
The general possibility improper operation
is that the surface of ground is not on the same level of the front cover of
the underground light. The Install ground is uneven, and there are often
pressures from pedestrians or cars. Therefore, the position of the pressed
rubber ring will lose its elasticity due to excessive pressure-and then it will
lead to the lamp leak water or vapor issue?
②"Short-term waterproof"
If the drainage is not handled properly,
the underground will leak if they are immersed in water for a long time. The
IP67 of the recessed underground light represents short-term waterproofing only.
For long time waterproof requirements and submersed lamp into water for a long
time, this kind of lamp should be IP68 underwater light required.
▲ There must be a large layer of space
under the lamp for filling with gravel, and there must be a drainage pipe at
the bottom so that the water can be drained and avoid the underground lamps soaked
in water for a long time.
▲Gravel
▲ Drain pipe.
If the recessed Underground lights are
soaked in water for a long time, the environment of the underground light in this
case is worse than in the environment in swimming pool. Because the ground is
often cleaned with detergents such as oxalic acid, oxalic acid is corrosive,
the underground light will be corroded or damaged by oxalic acid, so water or
vapor will probably seep into the housing of the underground lights.
So if the installation ground is on flat level
and there are drainage measures, will everything be fine and there will be no
water leakage issue? Unfortunately, even if these operations are reaches this
level and proper, it is still possible for LED underground lights to fail, or with
water infiltrated.
③Power connection for LED underground
Another possible cause of water leakage is
the power wiring.
Ordinary wiring with tape is actually not
waterproof, because water vapor will enter the interior of the lamp along the
gap of the tape wrapped around the wire, forming moisture or water mist inside
the lamp.
So the reasonable way should be to use a IP68
connector or waterproof junction box. The junction box is filled with soft silicone
glue; this way is helpful for preventing water vapor infiltrate to the housing
through the wire entry.
There are also many LED in-ground lights delivered
with IP67 waterproof male and female connector, most people take for granted it
is waterproof for this kind of connectors, BUT In fact, it is not waterproof (after
a long time)!
▲Normal Waterproof male and female plugs
In fact, due to man-made reasons such as
the tolerance and poor quality of male and female sockets, water will leak from
the gap.
Conclusion
Overall, the water leakage problem of the
buried LED lamp is either caused by the unqualified quality of the lamp itself,
or it is caused by the improper operation on installation.
After find out the reason of underground lights
leak problem, you are now able to know how to deal with and avoid the leakage problem
of outdoor lighting fixture. COMI Lighting is a professional manufacturer and
supplier on outdoor lighting, landscape lighting, and architectural lighting
luminaires, such as underground lights, in-ground light, underwater lights, swimming
pool lights, step lights, wall washer, landscape lights, garden lights, flood
lights and etc. If you need a professional company to help you handle the
lighting products, feel free to be invited to be one of our partners and
contact us @ sales@comilandscapelighting.com or call us 0086 755 2315 8250.