When selecting an LED street light for an outdoor project, IP65, IP66 and IP67 are often treated as interchangeable specifications.
They are not.
IP65, IP66 and IP67 all use the same basic IP Code system defined by IEC 60529, but the water-protection tests represented by the second digit are different. IEC 60529 defines degrees of protection provided by enclosures for electrical equipment.
For a road lighting project, this creates an important procurement question:
Should an LED street light be IP65, IP66 or IP67?
The answer is not simply:
“Choose the highest number.”
A higher IP rating is not automatically a better engineering choice for every street-lighting installation.
The correct rating depends on:
- Actual water exposure
- Installation geometry
- Drainage conditions
- Cleaning requirements
- Flooding risk
- Project specification
- Product construction
- Maintenance conditions
- Required evidence
For most conventional outdoor road-lighting applications, IP66 is often a more meaningful target than simply selecting IP67 because the number appears higher.
But that conclusion must be based on the installation environment and project requirements—not on marketing claims.
1. What IP65, IP66 and IP67 Actually Mean
The IP Code contains two characteristic digits.
The first digit addresses protection against access to hazardous parts and ingress of solid foreign objects.
The second digit addresses protection against water.
Therefore:
| Rating | First digit | Second digit | Main distinction |
|---|---|---|---|
| IP65 | 6 | 5 | Dust-tight + protection against water jets |
| IP66 | 6 | 6 | Dust-tight + protection against more powerful water jets |
| IP67 | 6 | 7 | Dust-tight + protection against temporary immersion |
The critical point is that:
IP67 does not simply mean “IP66 but better.”
The second digits represent different water-exposure tests.
IEC 60529 is the governing IP Code standard, and its current IEC consolidated publication is IEC 60529:1989+A1:1999+A2:2013, with subsequent corrigenda incorporated into the available consolidated material.
2. The First Digit Is the Same: 6
All three ratings begin with:
6
This is significant for outdoor street lighting.
The first digit 6 represents the highest solid-particle protection classification in the basic IP Code.
In practical terms, an IP6X enclosure is classified as dust-tight under the relevant IEC 60529 test.
Therefore:
- IP65
- IP66
- IP67
all have the same first-digit classification.
The difference between them is the second digit.
That means the real procurement question is:
What type of water exposure does the installation actually require?
3. IP65: Water Jets, Not Immersion
The second digit 5 represents a defined level of protection against water jets under IEC 60529.
For an LED street light, this means the enclosure has been tested against the relevant water exposure specified for IPX5.
This can be appropriate for products exposed to:
- Rain
- Wind-driven rain
- General outdoor weather
- Occasional water spray
- Normal outdoor maintenance conditions
However, buyers should not interpret IP65 as:
“The luminaire can withstand any water exposure.”
The test is performed under defined laboratory conditions.
The IP rating describes the result of a standardized enclosure test.
It does not describe every possible field condition.
4. IP66: Stronger Water-Jet Protection
IP66 uses the same dust-protection level as IP65:
IP6X
but the second digit is:
6
rather than 5.
The water test is therefore different.
For an LED street light, IP66 provides a stronger water-jet protection classification than IP65 under the IEC 60529 test system.
This is particularly relevant where the luminaire may experience:
- Heavy rain
- Strong wind-driven rain
- Water jets
- Outdoor cleaning
- More severe direct water exposure
For this reason, IP66 is widely encountered in outdoor lighting specifications.
But there is an important limitation:
IP66 does not mean temporary immersion protection.
That is a different IP Code requirement.
5. IP67: Temporary Immersion
IP67 has:
6 for solid-particle protection
and:
7 for water protection.
The second digit 7 represents protection against temporary immersion in water under the specified IEC 60529 test conditions.
This makes IP67 fundamentally different from IP66.
The engineering question changes from:
“Can the enclosure resist a powerful water jet?”
to:
“Can the enclosure withstand the defined temporary immersion test?”
This distinction matters when selecting an LED street light for locations where temporary flooding or water accumulation is a realistic possibility.
6. IP66 vs IP67: The Most Common Procurement Mistake
A common assumption is:
IP67 is higher than IP66, therefore IP67 is always better.
This is technically misleading.
The two ratings test different water-exposure conditions.
IP66
Designed around the relevant water-jet test.
IP67
Designed around the relevant temporary-immersion test.
Therefore:
IP67 does not automatically replace IP66 for every water-jet application.
Conversely:
IP66 does not provide the temporary-immersion classification represented by IP67.
This is one of the most important points for procurement teams to understand.
7. Why IP67 Does Not Automatically Mean “Better Than IP66”
Imagine two installations.
Installation A — Normal Roadside Installation
The luminaire is:
- Mounted on a pole
- Several metres above ground
- Exposed to rain
- Not normally submerged
- Properly installed with drainage around the pole
The major environmental concern is direct rainfall and water spray.
In this case, the relevant engineering requirement may be a water-jet protection level such as IP65 or IP66, depending on the project specification.
Selecting IP67 solely because it is numerically higher may add no meaningful project benefit.
Installation B — Flood-Prone Location
The luminaire is installed in an area where:
- Temporary flooding can occur
- Water can accumulate around equipment
- Drainage may be poor
- The lower part of an installation can become submerged
Here, an immersion-related requirement may become relevant.
IP67 can therefore address a different environmental risk.
8. IP67 Does Not Automatically Mean IP66
This deserves special attention.
Because:
7 > 6
many buyers assume:
IP67 includes everything covered by IP66.
That assumption should not be made simply from the digits.
IP ratings are classifications based on defined tests.
The second digit 6 represents one water test.
The second digit 7 represents another water test.
They are not merely steps on a single linear “waterproofness scale.”
For procurement, if a project specification explicitly requires:
IP66
a supplier should not simply respond:
“Our product is IP67, so it is automatically equivalent.”
The buyer should verify the applicable standard, product documentation and project acceptance criteria.
If both water-jet resistance and temporary immersion protection are important, the project may specify or accept a combined rating appropriate to the required tests.
9. IP65 vs IP66 for LED Street Lights
This is the more practical comparison for many road-lighting projects.
| Factor | IP65 | IP66 |
| Dust protection | IP6X | IP6X |
| Water test category | Water jets | More powerful water jets |
| Outdoor rain exposure | Yes, subject to test conditions | Yes, subject to test conditions |
| Heavy direct water exposure | More limited | Higher water-jet classification |
| Temporary immersion | No | No |
| Typical procurement question | Is normal water-jet protection sufficient? | Is stronger water-jet protection required? |
The decision should be based on the actual installation environment and specification.
10. When IP65 May Be Adequate
IP65 can be technically appropriate when the project requires the IP65 classification and the actual installation does not require a higher water-protection category.
Examples may include:
- Sheltered outdoor luminaires
- Certain urban road installations
- Locations without immersion risk
- Projects where IP65 is explicitly specified
- Applications where water-jet exposure is adequately addressed by the IP65 requirement
However, the final decision should always follow the project specification.
A buyer should not upgrade or downgrade an IP requirement without understanding why it was specified.
11. When IP66 Makes More Sense
IP66 becomes attractive when the luminaire is directly exposed to outdoor weather and the project requires a higher water-jet protection classification.
Typical considerations include:
- Open-road installation
- Heavy rainfall
- Wind-driven rain
- Regular outdoor cleaning
- Stronger water exposure
- Infrastructure projects with conservative environmental requirements
For many conventional LED street-light applications, IP66 is therefore a practical specification.
But:
“IP66 is common” is not the same as “IP66 is mandatory.”
The correct rating still depends on the project.
12. When IP67 Becomes Relevant
IP67 should be considered when temporary immersion is an actual design concern or when the project specification requires it.
Potential situations include:
- Flood-prone infrastructure
- Low-mounted outdoor equipment
- Locations where water can temporarily accumulate
- Installations near drainage channels
- Certain infrastructure environments
- Project specifications requiring temporary immersion resistance
The key question is:
Can the luminaire realistically become submerged?
If the answer is no, IP67 may not provide a meaningful advantage over an appropriately selected IP65 or IP66 rating.
13. Do Street Lights Really Need IP67?
For a conventional pole-mounted LED street light:
Not necessarily.
A pole-mounted luminaire is normally positioned well above the ground.
The environmental exposure is primarily:
- Rain
- Wind
- Dust
- Condensation
- Temperature cycling
- Solar radiation
- Pollution
rather than continuous or temporary immersion.
Therefore, an IP67 requirement should have an engineering reason.
If a specification simply states:
LED street light: IP67
the buyer should ask:
What environmental risk is the IP67 requirement intended to address?
That question can reveal whether the requirement is:
- A genuine environmental requirement
- A conservative client specification
- A copied specification
- A procurement preference
14. Do Not Select IP67 Just Because It Sounds More Premium
This is particularly important when comparing suppliers.
Supplier A:
IP65
Supplier B:
IP66
Supplier C:
IP67
It is tempting to rank them:
IP67 > IP66 > IP65
as if they were simple quality grades.
That is not the correct engineering interpretation.
The correct comparison is:
Which test condition does the project require?
This prevents buyers from selecting specifications based on marketing hierarchy rather than actual environmental conditions.
15. What IP Rating Says About the Enclosure
IP testing is fundamentally about the protection provided by an enclosure.
It does not directly measure:
- LED efficiency
- Driver lifetime
- Thermal performance
- Surge protection
- Corrosion resistance
- UV resistance
- Optical performance
- Road illumination
- Mechanical impact resistance
This distinction is essential.
An IP66 rating means:
The enclosure achieved the defined IP66 classification under the applicable test conditions.
It does not mean:
The entire luminaire is guaranteed to operate for a specified number of years in every outdoor environment.
16. IP Rating Does Not Prove Corrosion Resistance
An LED street light can have a high IP rating and still experience corrosion.
For example, IP testing does not by itself establish that:
- Aluminum housing will not corrode
- Coating will not degrade
- Stainless-steel fasteners are appropriate
- Salt exposure will not affect the product
- Marine environments are suitable
This is particularly important for:
- Coastal roads
- Ports
- Offshore-adjacent locations
- High-salinity environments
- Industrial areas
For these applications, corrosion resistance needs separate evaluation.
17. IP Rating Does Not Prove UV Resistance
Outdoor luminaires are exposed to sunlight for years.
Materials can experience:
- UV degradation
- Discoloration
- Embrittlement
- Seal degradation
- Plastic aging
An IP rating does not by itself establish long-term UV resistance.
The buyer should therefore evaluate material specifications and relevant environmental evidence separately when required.
18. IP Rating Does Not Prove Thermal Performance
This is another common misunderstanding.
A high IP rating generally requires a well-controlled enclosure design.
But a sealed enclosure can create thermal-design challenges.
LED street lights generate heat through:
- LED junctions
- Driver electronics
- Electrical components
The luminaire therefore needs an appropriate thermal path.
IP rating and thermal performance are different engineering characteristics.
A product can have:
IP66
and still require careful thermal evaluation.
19. IP Rating Does Not Prove Condensation Resistance
This is particularly important in outdoor luminaires.
A luminaire may experience large temperature changes between:
- Day
- Night
- Summer
- Winter
- Rain events
Temperature changes can affect internal air pressure and moisture conditions.
Therefore, a luminaire can have a high IP rating and still require careful design against internal condensation.
Possible design approaches can include:
- Pressure-equalization components
- Membranes
- Drainage strategies
- Appropriate sealing architecture
- Thermal design
The correct solution depends on the product construction.
The important point is:
IP rating and condensation management are related, but they are not the same engineering requirement.
20. Why the Test Report Matters More Than the Catalogue
A catalogue may state:
IP66
But a professional buyer should ask:
Where is the evidence?
A useful IP test report should allow the buyer to identify:
- Manufacturer
- Product name
- Exact model
- Test standard
- Test rating
- Test laboratory
- Test date
- Test configuration
- Test result
The critical connection is:
Tested Product = Purchased Product
21. The Exact Model Must Match
Suppose the test report states:
Model: YL-ST-100
But the quotation states:
Model: YL-ST-150
The buyer should not automatically assume that the IP test result applies to both.
The supplier should explain:
- Whether the housing is identical
- Whether the sealing system is identical
- Whether the product family was tested under a defined family configuration
- Whether the 150 W version has the same enclosure
- Whether additional evidence exists
The higher-power model may have:
- Different driver
- Different internal layout
- Different heat sink
- Different cable arrangement
- Different sealing interface
Therefore, model traceability matters.
22. The Housing Design Matters
An IP rating is achieved through the complete enclosure design.
Relevant components can include:
- Housing
- Lens
- Gasket
- Cable gland
- Connector
- Fasteners
- Access cover
- Pressure-equalization component
- Sealing surfaces
A change to one component can affect enclosure performance.
For example:
Changing a cable gland without considering its sealing characteristics can affect the final enclosure protection.
Therefore, a product’s IP rating should not be viewed as an isolated specification printed on the datasheet.
23. Installation Can Affect Real-World Water Protection
A tested luminaire and an installed luminaire are not necessarily exposed to identical conditions.
Installation variables can include:
- Cable entry orientation
- Cable gland installation
- Connector sealing
- Mounting angle
- Damaged gaskets
- Missing fasteners
- Incorrect tightening
- Field modifications
- Unapproved drilling
This is why:
Laboratory IP rating ≠ permission to install the product incorrectly.
The installation instructions remain important.
24. Why Cable Entries Deserve Special Attention
A street-light enclosure can have an excellent housing design but still be vulnerable at its interfaces.
Common interfaces include:
- Power cable entry
- Control cable
- Sensor connector
- NEMA socket
- Zhaga connector
- External communication connector
Every opening represents a potential path for ingress.
When reviewing an IP claim, the buyer should therefore ask:
Was the complete luminaire configuration tested, including the relevant cable entries and accessories?
This is more meaningful than asking only:
“Is the housing IP66?”
25. IP Rating and NEMA Are Not the Same System
Another procurement mistake is comparing:
IP66
directly with:
NEMA 4X
as though they were numerical equivalents.
They are different classification systems with different technical frameworks.
If a project specification references both IEC/EN IP requirements and NEMA requirements, each should be evaluated according to its own standard.
Do not convert one into the other using a simple number-to-number table and assume technical equivalence.
26. What Should a Buyer Ask the Supplier?
For an LED street light claimed as IP66, ask these questions:
Question 1
Which standard was used for the IP test?
Expected reference:
IEC 60529 or the applicable adopted equivalent.
Question 2
What exact model was tested?
The model should be traceable.
Question 3
Was the complete luminaire tested?
Not merely the empty housing.
Question 4
Does the tested configuration match the current production model?
This is critical.
Question 5
Which accessories were installed during testing?
Examples:
- Cable glands
- Connectors
- Control sockets
- Covers
Question 6
Can you provide the complete test report?
Not only a certificate image.
27. How to Review an IP Test Report
Use this sequence.
Step 1 — Check the Standard
Look for:
IEC 60529
or the applicable adopted standard.
Step 2 — Check the Product
Verify:
- Manufacturer
- Product
- Model
- Rated configuration
Step 3 — Check the Test Scope
Determine:
- What was tested?
- Which IP rating was evaluated?
- Was the complete luminaire tested?
Step 4 — Check the Result
The report should clearly demonstrate the relevant IP classification.
Step 5 — Check Traceability
Confirm that the tested configuration matches the product being quoted.
Step 6 — Check Changes
Ask whether the product has changed since the report was issued.
This includes:
- Housing
- Lens
- Gasket
- Driver
- Cable gland
- Connector
28. A Practical Example: IP65 vs IP66 vs IP67
Imagine a municipal project specifies:
Outdoor LED street light, minimum IP66.
Supplier A offers:
IP65
Supplier B offers:
IP66
Supplier C offers:
IP67
The correct procurement conclusion is not:
Supplier C wins because 67 is the highest number.
Instead:
Supplier A
Does not meet the stated minimum IP66 requirement unless the project specification allows an alternative.
Supplier B
Potentially meets the specified IP requirement, subject to verification of the test evidence and product configuration.
Supplier C
The IP67 claim must be reviewed against the project requirement. The buyer should not assume that IP67 automatically demonstrates the specific IP66 water-jet classification required by the specification.
This is a much more defensible engineering approach.
29. Another Example: Flood-Prone Road
Suppose a luminaire is installed in a location where temporary flooding is possible.
The project requirement may include:
IP67
The engineering question now changes.
The buyer should verify:
- Is IP67 actually specified?
- What immersion condition is required?
- Is the luminaire installed where water can reach it?
- Does the complete product configuration meet the requirement?
- Does the project also require a water-jet classification?
If both types of exposure matter, the specification should be interpreted carefully rather than assuming one rating automatically covers the other.
30. What Rating Should a Normal LED Street Light Use?
There is no universal answer.
However, the decision can be approached logically.
| Installation condition | Engineering question |
| Normal outdoor pole-mounted road | Is IP65 or IP66 required by the project? |
| Heavy rain / direct water exposure | Is stronger water-jet protection required? |
| Frequent cleaning / water jets | Is IP66 specified or justified? |
| Temporary flooding possible | Is an immersion classification such as IP67 required? |
| Permanent or special immersion exposure | A different and more specific requirement may be necessary |
The final specification should come from:
Project Requirement + Environmental Assessment + Product Evidence
not from a generic online recommendation.
31. Should You Specify IP66 or IP67 in an LED Street Light Tender?
If you are writing a tender specification, avoid simply writing:
“LED street light: IP67 or higher.”
That wording can create unnecessary ambiguity.
Instead, identify the environmental requirement.
For example:
“The complete luminaire shall comply with the specified enclosure protection classification according to the applicable edition of IEC 60529.”
Then define the required rating according to the actual project conditions.
If temporary immersion is not a realistic environmental condition, requiring IP67 solely because it sounds stronger may unnecessarily narrow the supplier pool without improving the relevant risk control.
32. IP66 Is Not a Lifetime Rating
Another important point:
IP66 does not mean 10 years of IP66 performance.
The IP test evaluates the enclosure under specified test conditions.
Long-term performance depends on:
- Material aging
- Gasket aging
- Thermal cycling
- UV exposure
- Corrosion
- Maintenance
- Installation quality
- Mechanical damage
Therefore, buyers evaluating a long-life infrastructure project should look beyond the IP number.
33. What Other Tests Should Be Reviewed Alongside IP?
For a professional LED street light evaluation, IP should be part of a broader technical package.
Depending on the project, review:
Safety
Applicable luminaire safety testing.
EMC
Emission and immunity requirements.
IK
Mechanical impact resistance where required.
Surge
Protection against transient overvoltage where specified.
Photometry
Light distribution and road-lighting performance.
Thermal
Operating temperature and thermal design.
Environmental
Corrosion, temperature, humidity or other environmental requirements where applicable.
This is why:
IP66 is one line in a technical approval checklist—not the approval itself.
34. IP Rating Procurement Checklist
Before approving an LED street light, verify the following.
Project Requirement
Required IP rating is clearly specified
Environmental conditions are understood
Flooding risk has been considered
Cleaning requirements are understood
Product
Exact model identified
Complete luminaire configuration identified
Cable entries identified
Connectors/accessories identified
Test Evidence
IEC 60529 or applicable equivalent identified
Complete test report available
Model matches product being purchased
Test rating clearly stated
Laboratory identified
Test date available
Configuration Control
Housing unchanged
Gasket unchanged
Lens unchanged
Cable gland unchanged
Connector configuration unchanged
Product revision checked
Installation
Installation instructions reviewed
Cable entry method understood
Mounting orientation confirmed
No unauthorized drilling/modification planned
35. The Five Questions That Matter Most
If you have only five minutes to evaluate an LED street light’s IP claim, ask:
1. What IP rating does the project actually require?
Not:
What is the highest rating available?
2. Which standard was used?
Usually:
IEC 60529
or the applicable adopted standard.
3. What exact product was tested?
Check:
Model + configuration
4. What water exposure does the rating represent?
For example:
IP65 / IP66 → water-jet classifications
IP67 → temporary immersion classification
5. Does the tested configuration match the product we will receive?
This final question is often more important than the difference between IP65 and IP66 on a marketing datasheet.
Frequently Asked Questions
Is IP66 better than IP65 for LED street lights?
IP66 provides a higher water-jet protection classification than IP65 under IEC 60529.
Whether it is required depends on the project’s environmental conditions and specification.
Is IP67 better than IP66?
Not in the simple sense of “higher number = better.”
IP66 and IP67 represent different water-protection test categories.
IP66 concerns the relevant water-jet test, while IP67 concerns temporary immersion.
The correct rating depends on the environmental risk.
Can an IP67 LED street light replace an IP66 requirement?
Do not assume so.
If a project specifically requires IP66, the supplier should provide evidence that the product meets the specified requirement.
IP67 should not automatically be treated as technically identical to IP66 merely because 7 is numerically greater than 6.
Is IP65 enough for an outdoor LED street light?
It can be, depending on the project.
The correct answer depends on:
- Rain exposure
- Water-jet exposure
- Installation conditions
- Project specification
There is no universal rule that every street light must be IP66 or IP67.
Do all LED street lights need IP66?
No.
IP requirements should be based on the project and environment.
IP66 is common for outdoor luminaires, but “common” does not mean “universally mandatory.”
Does IP67 mean the LED street light can be permanently underwater?
No.
IP67 represents temporary immersion under the defined IEC 60529 test conditions.
It should not be interpreted as a general permanent-submersion rating.
Does IP66 protect against flooding?
IP66 is based on the applicable water-jet test and should not automatically be interpreted as protection against immersion.
If flooding and immersion are realistic risks, the project should consider the appropriate immersion-related requirement.
Does IP66 guarantee that water can never enter the luminaire?
No.
The rating represents performance under defined test conditions.
Long-term field performance also depends on:
- Installation
- Seals
- Materials
- Aging
- Mechanical damage
- Maintenance
Does IP66 mean the LED street light is corrosion-resistant?
No.
IP and corrosion resistance are different characteristics.
Coastal or industrial environments may require separate corrosion evaluation.
Does IP66 guarantee LED driver lifetime?
No.
IP testing does not establish driver lifetime.
Driver reliability requires separate technical evaluation.
Does IP66 prove good thermal performance?
No.
IP protection and thermal management are separate engineering characteristics.
A well-sealed luminaire still needs an appropriate thermal design.
Should buyers request an IP test report?
For important projects, yes.
A traceable test report provides substantially more useful evidence than a catalogue statement alone.
The buyer should verify that the report applies to the actual product configuration.
Final Engineering Decision
For LED street lights, the choice between IP65, IP66 and IP67 should not be made by comparing the numbers as if they were a simple quality ranking.
The correct decision process is:
1. Identify the environmental exposure.
↓
2. Identify the project requirement.
↓
3. Identify the applicable IP Code requirement.
↓
4. Verify the complete product configuration.
↓
5. Review the actual test evidence.
↓
6. Confirm installation conditions.
The practical distinction is:
IP65
→ Dust-tight + defined water-jet protection.
IP66
→ Dust-tight + higher water-jet protection.
IP67
→ Dust-tight + defined temporary-immersion protection.
The most important point is:
IP67 is not simply “IP66 plus one.”
It represents a different water-exposure classification.
For a conventional pole-mounted LED street light, the correct choice is usually determined by the project’s required water exposure rather than by choosing the highest available number.
For a flood-prone installation, immersion protection may become important.
For a normal exposed roadside luminaire, water-jet protection may be the more relevant requirement.
And for any serious procurement decision, the IP number should be treated as only one part of the evidence chain:
Project Requirement → IEC 60529 Classification → Test Report → Product Configuration → Installation
That is the difference between selecting an LED street light by specification sheet and evaluating it as an engineering product.
Related LED Street Light Technical Articles
For a complete technical evaluation, also review:
Understanding LED Street Light Test Reports
How to Read an LED Street Light Test Report
How to Verify Whether an LED Street Light Test Report Is Genuine
LED Street Light Standards Explained: IEC, EN, IP, IK, EMC and Photometric Requirements
These articles form a technical sequence:
Standards → Test Reports → Verification → IP Requirement → Procurement Decision
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For an international LED street lighting project, the useful question is not simply:
“Is this product IP66?”
The more important question is:
“Does the tested IP classification, product configuration and installation condition satisfy our project requirement?”
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Contact Yilong for LED street light technical documentation and project support.
Evidence Sources
The technical foundation for this article is IEC 60529, which defines the IP Code and degrees of protection provided by enclosures.
For the broader street-lighting context, IEC 60598-2-3 specifies particular requirements for luminaires for road and street lighting and other public outdoor lighting applications. The IEC currently lists the consolidated IEC 60598-2-3:2002+A1:2011 publication as valid and shows a fourth edition under development.
Important: IP65/IP66/IP67 classifications in this article describe the IEC 60529 classification system. They should not be interpreted as a universal recommendation that every LED street light must have one particular rating. The required rating remains project- and environment-dependent.
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