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What Is an IP Rating? A Guide to Ingress Protection in Lighting

ip rating

An IP rating is one of the most important specifications in modern lighting, yet it is still frequently misunderstood or overlooked during product selection. Whether you are managing a commercial build, upgrading an outdoor lighting system, or maintaining an industrial facility, choosing the correct IP rating directly impacts performance, safety, and long-term cost efficiency.

Lighting systems are constantly exposed to environmental elements that can lead to gradual degradation or sudden failure. Dust, moisture, humidity, and water intrusion can damage internal components, reduce lifespan, and increase maintenance costs. This is where the IP rating becomes critical.

Understanding the correct IP rating helps prevent premature failures, reduces maintenance frequency, and ensures long-term lighting performance.

What Is an IP Rating?

An IP rating, or Ingress Protection rating, is a standardized classification system that defines how well a lighting fixture is protected against solid objects and liquids.

The IP rating is expressed using two digits after the letters IP, such as:

  • IP20

  • IP44

  • IP65

  • IP67

Each digit represents a specific type of protection:

  • The first digit indicates protection against solid objects like dust

  • The second digit indicates protection against water

This system allows you to quickly compare lighting fixtures and determine whether a product is suitable for a specific environment.

What Does IP Stand For?

IP stands for Ingress Protection. Ingress refers to the entry of unwanted materials into a product enclosure.

In lighting applications, this includes:

  • Dust and airborne particles

  • Dirt and debris

  • Moisture and humidity

  • Rain and water spray

  • Temporary or accidental immersion

The IP rating provides a consistent framework for evaluating a fixture’s resistance to these environmental factors.

How an IP Rating Is Structured

An IP rating always consists of two digits.

Example: IP65

  • First digit (6): Protection against solids

  • Second digit (5): Protection against water

If a digit is replaced with X, it means that category was not tested.

  • IPX4 means water protection is tested, but not solid protection

  • IP6X means dust protection is tested, but not water protection

Understanding this structure allows faster decision-making when comparing products.

First Digit: Protection Against Solids

The first digit ranges from 0 to 6 and measures protection against solid objects and dust.

  • 0: No protection

  • 1: Objects larger than 50 mm

  • 2: Objects larger than 12.5 mm

  • 3: Objects larger than 2.5 mm

  • 4: Objects larger than 1 mm

  • 5: Dust protected (limited ingress allowed)

  • 6: Dust-tight (no ingress)

Dust is a major concern in many environments:

  • Warehouses

  • Manufacturing plants

  • Agricultural facilities

When dust enters a fixture, it can trap heat and damage internal components. A higher IP rating, such as IP65, helps extend fixture lifespan and maintain performance.

Second Digit: Protection Against Water

The second digit ranges from 0 to 9 and defines water resistance.

  • 0: No protection

  • 1: Dripping water

  • 2: Dripping water when tilted

  • 3: Spraying water

  • 4: Splashing water

  • 5: Water jets

  • 6: Powerful water jets

  • 7: Temporary immersion

  • 8: Continuous immersion

  • 9: High-pressure, high-temperature jets

Different environments require different levels of protection. Choosing the right IP rating ensures durability and safety.

What Does IP20 Mean in Lighting?

An IP20 IP rating provides:

  • Protection against solid objects larger than 12.5 mm

  • No protection against water

Suitable environments include:

  • Offices

  • Conference rooms

  • Retail interiors

  • Residential spaces

Avoid using IP20 in:

  • Bathrooms

  • Kitchens near sinks

  • Outdoor areas

What Does IP44 Mean?

An IP44 IP rating provides:

  • Protection against objects larger than 1 mm

  • Protection against splashing water

Common applications:

  • Bathroom vanity lights

  • Covered outdoor spaces

  • Utility rooms

  • Hallways

It is not suitable for heavy rain or direct water jets.

Is IP65 Waterproof?

IP65 is one of the most widely used IP ratings in commercial lighting.

It means:

  • 6: Dust tight

  • 5: Protection against water jets

Common uses:

  • Exterior wall lights

  • Parking lot lighting

  • Landscape lighting

  • Building facades

Important note:

  • IP65 is weather-resistant, not submersible

  • For submersion, use IP67 or higher

IP67 and Higher Ratings

Higher IP ratings provide additional protection:

  • IP67: Temporary immersion up to 1 meter

  • IP68: Continuous immersion

  • IP69: High pressure washdown environments

Typical use cases:

  • Flood prone areas

  • Underground lighting

  • Water features

  • Marine environments

IP Rating Requirements for Industrial Environments

Industrial settings demand higher protection due to harsh conditions.

Common recommendations:

  • IP65: General industrial use

  • IP66: Heavy water exposure or washdowns

  • IP69: Sanitation zones and food processing

Environmental risks include:

  • Airborne dust

  • Chemical exposure

  • High pressure cleaning

Choosing the right IP rating ensures reliability and safety.

How IP Ratings Are Tested

IP ratings are verified through standardized testing.

Dust testing involves:

  • Sealed chambers with circulating particles

  • Ensuring no harmful dust enters the fixture

Water testing methods include:

  • Drip tests

  • Spray nozzles

  • Oscillating tubes

  • Immersion tanks

  • Pressurized jets

How to Choose the Right IP Rating

Selecting the correct IP rating starts with evaluating the environment.

Ask the following:

  • Is dust present?

  • Will there be water exposure?

  • Is flooding possible?

  • Are high pressure cleaning methods used?

Also consider:

  • Local building codes

  • Maintenance requirements

  • Warranty conditions

  • Budget constraints

The goal is to match the IP rating to actual conditions without overspending.

Why the Right IP Rating Matters

Choosing the correct IP rating helps:

  • Reduce maintenance costs

  • Prevent early fixture failure

  • Improve long-term performance

  • Ensure safety compliance

  • Protect your investment

A poorly chosen IP rating can lead to repeated replacements and operational issues.

A Trusted Partner for Lighting Solutions

Selecting the right IP rating is only part of the equation. Having a dependable supplier ensures the entire lighting system performs as expected.

Commercial Lighting Industries has supported contractors and facility managers since 1989, evolving into a full-line lighting partner for:

  • Interior lighting

  • Exterior lighting

  • Lighting controls

With access to hundreds of manufacturers, the company focuses on:

  • Product quality

  • Availability

  • Performance

  • Value

Working with an experienced partner helps eliminate guesswork, avoid costly mistakes, and ensure every fixture is specified correctly for its environment.

Conclusion

An IP rating may seem like a small detail, but it plays a critical role in lighting performance, durability, and long-term cost control. Understanding how IP ratings work helps you make smarter specification decisions, reduce risk, and ensure your lighting systems perform reliably in real-world conditions.

Choosing the right IP rating helps minimize maintenance, prevent premature failures, and protect your investment across every application.

If you want to get it right from the start, Commercial Lighting Industries is here to help. As a trusted commercial lighting supplier, we work closely with contractors, facility managers, and project owners to recommend the right lighting solutions for every environment.

Contact Commercial Lighting Industries today to see how we can support your next project and help you achieve reliable, high-performance results.

FAQs

What does an IP rating tell you about a lighting fixture?

An IP rating tells you how well a lighting fixture is protected against dust and water. The first digit refers to solids, and the second refers to liquids.

Is a higher IP rating always better?

No. The best IP rating is one that matches the environment. Higher ratings can increase costs without added benefit.

How long does an IP rating remain effective?

An IP rating reflects performance at testing, but seals can degrade over time. Maintenance helps preserve protection.

What is the difference between IP65 and IP67?

IP65 protects against dust and water jets, while IP67 adds protection against temporary immersion.