In outdoor lighting projects, waterproof ratings are often one of the most misunderstood specifications.
Many engineers and contractors have experienced situations like these:
This raises two important questions:
The truth is:
Higher IP ratings are not always better.
Choosing the right level of protection requires careful consideration of your installation environment, operating conditions and project specifications.
At ACE – a professional outdoor lighting manufacturer – choosing the right waterproof structure is key to long-term reliability for industrial, commercial, agricultural and harsh environment applications.
IP stands for:
Ingress Protection
It is an international protection standard established by the IEC (International Electrotechnical Commission).
An IP rating consists of two numbers.
For example:
The two digits represent different types of protection.
This number indicates protection against solid particles such as dust.
For outdoor lighting, a rating of:
This is generally considered the minimum standard for professional outdoor luminaires.
This number indicates resistance to water exposure.
Protection against water jets from any direction.
Suitable for normal outdoor rain exposure.
Protection against powerful water jets or heavy wave impact.
Suitable for harsh weather and coastal conditions.
Protection against temporary immersion in water.
Typically tested at:
Protection against continuous immersion.
Specific depth and duration depend on the manufacturer’s testing specifications.
Higher waterproof ratings require increasingly complex sealing structures and manufacturing processes.
This directly affects product cost.
Lowest among outdoor waterproof ratings.
For many projects, IP65 is already sufficient.
Typically 15%–20% higher than IP65.
Usually 30%–40% higher than IP65.
Can exceed twice the cost of IP65 products.
This is one of the biggest misconceptions in outdoor lighting.
Many people assume:
“The higher the number, the better the waterproof performance.”
But IP66 and IP67 are tested under completely different conditions.
Tests resistance to:
Tests resistance to:
This means:
The correct choice depends on the actual environmental conditions—not simply the larger number.
Selecting the proper waterproof rating is essential for balancing:
Below are practical recommendations for common projects.
These fixtures are usually installed above ground level and exposed mainly to rainwater.
In most standard outdoor applications, IP65 provides adequate protection without unnecessary cost increases.
These environments involve:
IP66 offers stronger sealing performance and better resistance to hydraulic impact.
At ACE, many outdoor lighting solutions are specifically designed for harsh coastal and corrosive environments, helping improve long-term reliability in challenging applications.
These locations may experience temporary water accumulation during storms or heavy rainfall.
IP65 is often insufficient in these situations.
IP67 provides additional protection against short-term immersion.
For permanently submerged applications, IP68 is mandatory.
However, it is important to verify:
Not all IP68 products are tested under the same standards.
Even if products are technically rated IP65, ground installations are far more vulnerable to water accumulation.
For safety and durability, IP67 is generally recommended.
When selecting outdoor lighting products, there are several important details many buyers overlook.
Always verify:
A professional manufacturer should be able to provide official documentation.
IP68 is not a fixed universal standard.
Manufacturers define:
These parameters must be clearly confirmed before project approval.
They solve different environmental challenges.
Do not compare them based only on numerical order.
This is an important engineering consideration.
The more sealed a fixture becomes, the more difficult thermal management can become.
Poor heat dissipation may lead to:
This is why professional outdoor lighting design must balance:
In industrial, commercial, and agricultural lighting, waterproof performance directly affects:
As a manufacturer specializing in harsh-environment lighting, ACE focuses on delivering high-quality and energy-efficient lighting solutions for:
ACE offers a full range of products including:
With in-house mold development, professional R&D capabilities, a CNAS-accredited laboratory, and strict quality management systems, ACE provides customized lighting solutions tailored to demanding project requirements worldwide.
There is no universally “best” waterproof rating between IP65, IP66, IP67, and IP68.
There is only:
The most appropriate rating for the actual application.
Choosing correctly helps achieve:
Choosing incorrectly can lead to:
Before selecting outdoor lighting, always evaluate:
Then choose the waterproof rating that truly matches the project requirements.
