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The IP protection classes used in lighting fixtures determine a product’s level of resistance to dust and water, playing a critical role in terms of both safety and performance. Especially for industrial facilities, outdoor areas, chemical process zones, and applications exposed to high humidity, selecting the correct IP rating makes it possible to ensure long-lasting operation of equipment and a fault-free operating experience. In this context, the commonly encountered IP65, IP67, and IP68 protection classes may appear similar, but they contain significant differences in terms of their areas of use and the level of protection they provide. Accordingly, if you are wondering about the differences between IP65, IP67, and IP68 protection classes and in which environments they should be used, take a look at our content.
The IP Protection Rating (Ingress Protection) is an international standard that defines the level of resistance of electrical and electronic devices against external factors and is described according to IEC 60529 standards. This classification expresses, with two digits, the degree to which a device is protected against dust, solid objects, and water. In this context, the first digit indicates the level of protection against dust and solid particles, while the second digit indicates resistance to water. For example, IP65 means that the device is completely dust-tight and can withstand low-pressure water jets coming from all directions.
In this context, if the correct IP rating is not selected for outdoor lighting, industrial machinery, in-pool fixtures, or any equipment exposed to harsh climate conditions, serious issues such as water leakage, corrosion, electronic malfunctions, and premature wear may occur. Therefore, great care must be taken when selecting the IP protection rating.
The IP Code is a two-digit protection classification that indicates a device’s level of resistance to external factors, and correctly interpreting this code is critically important in understanding the environments in which the product can be used safely. In this context, the first digit following the IP designation represents the level of protection against solid objects and dust; this value ranges from 0 to 6, with level 6 representing completely dust-tight structures. The second digit indicates the degree of resistance to water; this value ranges from 0 to 9 and represents different levels of protection, from basic resistance against water droplets to protection against high-pressure water jets or prolonged underwater use.
For example, in the IP67 code, “6” means complete protection against dust, while “7” indicates that the device can withstand immersion in water up to 1 meter deep for 30 minutes. Therefore, correctly reading the IP code is of great importance in accurately evaluating the areas of use and durability levels of many devices, from lighting products to industrial equipment.
The IP protection level is determined as a result of laboratory tests conducted in accordance with international standards to measure a device’s resistance to dust and water. In this process, the device is subjected to specific test procedures defined in the IEC 60529 standard. Accordingly, in the first stage, the product undergoes dust chamber tests to measure its level of protection against solid objects of various sizes and dust particles. Then, to determine the level of water protection, tests such as water spray tests, low- and high-pressure water jet tests, immersion tests, or long-term underwater resistance tests are performed. If the device successfully passes all these tests, it is classified with the appropriate IP code. Therefore, the IP protection level is not a subjective preference of the manufacturer, but an objective assessment based on international technical procedures.
There are many IP protection classes depending on the area of use, each with its own specific characteristics. These protection classes are mainly divided into three: IP68, IP65, and IP67. If we examine these IP protection classes in detail:
IP65 is an international protection class that defines the resistance of a fixture or electrical device against dust and water. In this class, the number “6” indicates that the device is completely dust-tight, meaning dust particles cannot penetrate the internal components. The number “5” indicates that the device is protected against low-pressure water jets from all directions. Therefore, a product with an IP65 rating can be safely used against external factors such as rain, humidity, and splashing water; however, it is not suitable for full immersion in water. Additionally, the IP65 protection class is commonly preferred for outdoor wall fixtures, streetlights, garden lighting, and general lighting products in industrial areas.
The IP67 protection class indicates that a device is both dust-tight and resistant to immersion in water for a certain period. In the code, “6” signifies complete dust protection, while “7” means the device can remain submerged in water up to 1 meter deep for up to 30 minutes. This level ensures safe use in outdoor environments where water may temporarily rise or during heavy rain. Additionally, IP67 fixtures are commonly used for recessed floor lighting, garden pathways, landscaping applications, and areas that may occasionally come into contact with water.
Finally, IP68 is one of the highest protection classes against dust and water. The “6” again indicates that the device is completely dust-tight, while “8” signifies that the device’s water immersion resistance is much higher compared to IP67. IP68 lighting can operate continuously underwater, depending on the conditions specified by the manufacturer, and can often withstand depths greater than 1 meter. Therefore, IP68 fixtures are an ideal choice for in-pool lighting, fountain systems, underwater landscaping applications, and high-humidity industrial environments.
There are also differences within the IP ratings themselves. If we examine these points in detail:
These are harsh environments such as shipyards, salty water vapor, high humidity, rain, chemical splashes, and areas with heavy particles from metalworking. In this context, the fixtures used must be highly protected against both corrosion and water ingress, so shipyard lightingthe ideal IP rating is in the IP66–IP67 range. While IP66 provides sufficient protection against high-pressure water and harsh external factors, in areas with close contact with seawater, IP67 is preferred to ensure the fixture is also resistant to short-term water immersion.
Heavy industrial facilities, with intense environmental factors such as metal dust, oil vapor, high temperatures, and vibrations, require fixtures with high sealing and robust body construction. In this context, an IP65–IP66 rating is suitable for heavy industrial lighting. While IP65 completely prevents dust ingress, IP66 provides additional protection against heavy liquid sprays and high-pressure cleaning operations. Thus, heavy industrial lighting it ensures long-term and stable operational performance.
Metro, train, and tram stations consist of both indoor and semi-open areas, requiring fixtures that are resistant to external factors such as water, humidity, and airflow. For indoor metro areas, IP54–IP65 the levels are sufficient; however, on open platforms, due to the effects of rain and wind, a minimum IP65 use is recommended. In areas near outdoor lines or stations that undergo frequent cleaning, however, IP66 a higher level is preferred to provide greater water resistance. Thus, LED lighting for stationshigh efficiency is achieved in.
Chemical plant lightingSince chemical plants are hazardous environments with acid vapors, solvents, corrosive gases, and chemical liquids, fixtures must have high protection against water and dust. In these environments, IP66–IP67 fixtures should be used. While the IP66 rating is sufficient against chemical splashes and heavy cleaning operations, in areas above process tanks or where there is intense chemical vapor, IP67 is preferred to ensure safer and longer-lasting use.
Since in-pool fixtures operate continuously underwater, the highest IP rating is required. Therefore, for swimming pool lighting, IP68 the IP68 class is mandatory. Additionally, since IP68 fixtures are suitable for continuous underwater use under the depth and duration conditions specified by the manufacturer, they provide ideal protection in terms of both safety and longevity. This is because fixtures with an IP67 rating swimming pool lighting are not sufficient.
Factories, while containing dust, oil, and humidity in enclosed environments, are exposed to intense external factors at construction sites due to open-air conditions, mud, rain, and transported materials. In factories, IP65 the level is sufficient for general use, while in harsher conditions such as construction sites, IP66 a higher level is required. Thus, Factory and construction site lighting It provides full protection against dust while maintaining resistance to water splashes and outdoor conditions.
In facilities with different production processes, environmental conditions vary. In light production lines, IP54–IP65 the range is sufficient, while in food production or chemical processing lines, where regular washing is performed, IP66 a higher level is required. In areas with high humidity or a high risk of liquid contact, however, IP67 it is preferred, increasing the electrical safety and lifespan of the fixtures. Thus, Production facility lightinglong-term use can be achieved in.
Warehouses, storage areas, and loading zones are generally large and dusty environments. Therefore, due to forklift traffic, open doors, and airflow, fixtures must be resistant to dust and humidity variations. While an IP54–IP65 rating is sufficient for enclosed warehouse areas, for open loading ramps, outdoor storage areas, and high-humidity zones, IP65–IP66 levels are preferred, ensuring that logistics lightingsafe operation against environmental factors is ensured.
There are many benefits provided by the correct IP protection class. These benefits provide advantages in terms of both occupational safety and energy efficiency. To take a look at the mentioned benefits, they are as follows;
In explosion-proof products, the IP rating is a critical component of hazardous area safety and directly affects the product's safety not only in terms of flameproof integrity but also regarding its resistance to external factors. Specifically, an explosion-proof certificate guarantees that a device will not cause an explosion triggered by sparks or heat in environments containing explosive gas, vapor, or dust; however, this certificate alone does not provide protection against the ingress of dust and water. This is where the IP rating comes into play. An insufficient IP level can negatively affect the equipment's surface temperature, electrical insulation, or mechanical integrity by increasing the leakage of water or dust into the explosive environment. This situation may increase the risk of sparking and jeopardize the device's operation in compliance with ATEX requirements. For this reason, high protection levels such as IP65, IP66, or IP67 are generally preferred for explosion-proof products. Consequently, a high IP rating guarantees both compliance with safety standards and a long-lasting, stable operating performance, especially in demanding industrial areas such as oil refineries, chemical plants, mines, and paint production lines.
When selecting IP-protected products, certain key points must be taken into consideration. This ensures that you can obtain maximum efficiency from the product. In this context, the points to be considered are as follows;
IP67 indicates that the product is water-resistant at a depth of up to 1 meter for a duration of 30 minutes. Therefore, it is considered "waterproof" for short-term underwater contact. However, if it is to be used continuously underwater or under high pressure, IP68 should be preferred.
Yes. IP65 provides sufficient protection against outdoor conditions such as rain, snow, wind-blown dust, and water splashes. However, in risky areas such as those prone to flooding, water accumulation, or frequent washing, IP67 is safer.
Generally, yes. Since the risk of contact with water indoors is very low, a high level of protection like IP68 increases costs unnecessarily. For this reason, protection levels between IP20–IP44 are usually sufficient, except for bathrooms, spas, or industrial washing areas.
The correct IP rating ensures that the fixture is protected from malfunctions caused by moisture, dust, and water. This is because if an appropriate IP level is not selected, water leakage, corrosion, and electronic component failures are accelerated. At this point, the IP class directly affects the lifespan of the fixture, especially in outdoor and harsh conditions.
No. All three have the "6" level, which provides full protection against dust. The only difference between them is the level of water resistance.
For all fixtures that will operate inside a pool or continuously underwater, IP68 must be used. IP67, on the other hand, only withstands short-term immersion, so it is not suitable for in-pool use.
For garden and landscape lighting, IP65 is sufficient for general use. However, for ground-recessed applications or areas with a risk of water accumulation, IP67 should be preferred.
No. IP65 withstands low-pressure water sprays. For this reason, in areas where cleaning with pressurized water is required, IP66 or IP67 ratings should be preferred.
IP ratings do not indicate chemical resistance. However, since IP68 fixtures are generally manufactured with more durable body structures and sealing systems, they may be stronger against chemical effects. Nevertheless, it is necessary to check the technical documentation for chemical resistance.
Ground-recessed fixtures are in intense contact with water accumulation, rain, pressure, and humidity. At this point, a minimum of IP67, preferably IP68, is recommended.
In such environments, IP66, IP67, or IP68 levels should be preferred. However, the IP rating alone is not sufficient; the body material must also be resistant to saltwater corrosion (for example, 316L stainless steel or marine-grade aluminum).
