IP65 vs IP66 vs IP67 vs IP68 — Which Rating Do You Need?

What an IP Rating Does—and Does Not—Tell You

The IP code helps define how an enclosure resists dust and water under specified test conditions. It is an important part of outdoor luminaire selection, but it does not by itself prove complete fixture safety, corrosion resistance, weathering performance, compatibility with cleaning chemicals or service life.

For architectural lighting projects, select the IP rating according to the actual installation exposure: rain, water jets, cleaning procedures, temporary pooling, continuous submersion, cable-entry conditions and the complete installed connection system.

How to Read the IP Code

In IP65, IP66, IP67 and IP68, the first digit 6 addresses protection against dust ingress. The second digit describes a different water-exposure test category. Water protection must be understood within the relevant test conditions, not as an absolute promise of zero water ingress in every field situation.

IP65 — Water Jets Under Specified Test Conditions

IP65 addresses protection against water jets under the applicable test conditions. It may be appropriate for facade luminaires that will not be submerged, provided the site exposure, cleaning method, mounting orientation, cable entries and installation details are suitable.

Do not interpret IP65 as a universal answer for all outdoor installations. Review expected rain exposure, wash-down procedures, road spray, drainage and the complete connection system before final selection.

For a look at how jet-water testing is carried out in the laboratory, the photos below show the SP-DKP-F170 LED spot light sample through its dust-exposure and water-jet test sequence.

Dust test — sample after exposure

Water jet test — in progress

Water jet test — sample after exposure

IP66 — Powerful Water Jets Under Specified Test Conditions

IP66 addresses protection against powerful water jets under specified test conditions. It can be relevant where exterior luminaires are exposed to more demanding wash-down procedures or direct water spray.

IP66 does not automatically establish temporary-immersion protection. If an installation can also experience pooling or immersion, verify the documented protection for both exposures and confirm the corresponding marking, such as IP66/IP67 where applicable.

Where pressure washing is planned, compare the cleaning pressure, nozzle distance, water temperature and chemicals with the documented test conditions and the manufacturer’s cleaning instructions. An IP66 rating alone does not approve every pressure-washing procedure. The LWW-WZB-W55 may be reviewed as an IP66 product example, with its configuration and permitted cleaning conditions checked against the project requirements.

Pressurized jet spray test

Post-test dimension check

Open-lid inspection

IP67 — Temporary Immersion Under Specified Conditions

IP67 addresses temporary immersion under specified test conditions. It can be relevant where water may pool around a luminaire or where short-term immersion is a credible installation risk.

An IP67 immersion rating does not automatically establish IP65 or IP66 jet-water protection. Where high-pressure cleaning or powerful water jets are expected, verify the required jet-water test separately.

The photographs below illustrate water-jet testing of a LWW-OP-D80 sample. They do not establish IP67 immersion performance; temporary-immersion protection requires the corresponding test evidence.

180° spray test

270° spray test

Drying & inspection

IP68 — Continuous Immersion Under Declared Conditions

IP68 applies to continuous immersion under conditions declared by the manufacturer. The depth, duration, operating state and installation conditions must be checked because IP68 is not one universal test level.

For underwater fixtures, verify the declared depth and duration, applicable luminaire safety requirements, electrical system, cable entries and the complete installation method. IP68 alone does not replace underwater luminaire safety and installation requirements.

Choose an IP Rating for the Installation Conditions

For facade luminaires that will not be submerged, assess IP65 or IP66 against the site exposure and approved cleaning procedure. Where water can pool or the luminaire will operate underwater, verify immersion protection for the intended depth, duration and operating conditions, together with drainage and installation requirements.

If both water jets and temporary immersion are expected, do not assume that the higher number covers both test categories. Verify documented evidence for both exposures and the corresponding marking.

IP Rating Is Not a Complete Outdoor-Durability Claim

An IP rating alone does not establish complete luminaire safety, weather resistance or service life. Review the applicable luminaire safety requirements, destination-market requirements, and evidence for temperature, corrosion, UV exposure, impact resistance, driver reliability and sealing where relevant to the project. Cable entries, connectors, junction boxes and installation details must also suit the environment.

State performance and service-life claims with their supporting model, configuration, conditions and evidence. Warranty coverage is a separate commitment defined by its formal terms.

How to Describe Outdoor Luminaire Standards

IEC 60529 defines enclosure IP protection; it is not the complete standard for outdoor luminaire safety or service life. For project selection, verify the applicable luminaire safety requirements, project specifications, destination-market rules and the actual scope of the product reports before making a specific compliance statement.

Documented Example: LWW-PZT-W38A IP66 Test Report

The W38A report provides a practical example of documented IP66 testing. Report EGZ2410080117R00103R was issued by EMTEK (Guangzhou) on 31 October 2024 for the submitted LWW-PZT-W38A sample. The recorded jet-water conditions were a 12.5 mm nozzle, a flow of 100 L/min, a three-minute test and a nozzle distance of 2.5–3 m. The recorded result was Pass. Confirm the report’s coverage for the ordered configuration and installed connections.

LWW-PZT-W38A — IP66 test report (PDF) · Verify at EMTEK

LWW-OP-D80 — IP69K test report (PDF)

The luminaire rating is only one part of the installed outdoor system.

Do not extend this report to all product configurations, connectors, cable assemblies or installation conditions unless the relevant coverage is documented.

Conclusion

Choose IP protection by matching documented tests to the real exposure. For outdoor architectural lighting, the correct decision is not “the highest IP number available.” It is the rating, luminaire safety evidence, connection system, material performance and installation method that match the project environment.

Reference Links and Evidence Notes

The following references point to the official standard scope pages and the public report files. They are listed as references — not as proof that every TPK product complies with every listed standard.

• IEC 60529 — official scope (IEC Webstore)
• IEC 60598-1 — official scope (IEC Webstore)
• IEC 60598-2-5 — official scope (IEC Webstore)
• IEC 60598-2-18 — official scope (IEC Webstore)
• IEC 62722-2-1 — official scope (IEC Webstore)
• Public LWW-PZT-W38A IP66 test report (PDF)
• Verify LWW-PZT-W38A report online (EMTEK official check)
• Public LWW-OP-D80 IP69K test report (PDF)

About these references: Official IEC catalogue pages describe standard scope. They do not establish TPK product compliance. Product claims must be tied to the actual submitted model, configuration, report and project conditions.