IP Ratings Explained: How to Read IP65, IP66 and IP67 on a Light Fixture

Look at the label on almost any vapor tight or outdoor light fixture and you'll find two letters and two digits: IP65, IP66, IP67. Those four characters say more than "waterproof" or "weatherproof" ever could, because each digit maps to a defined test. Here's how to read an IP rating in 2026, which numbers actually matter for lighting, and how to match the rating to the room.

What an IP rating is

IP stands for Ingress Protection (you'll also see "International Protection"). The code comes from the international standard IEC 60529, also published as EN 60529. It rates how well an enclosure keeps out two things: solid objects such as fingers, tools, and dust, and water, from drips all the way to immersion. The point of the standard is to replace vague marketing words with a number that was tested.

The first digit: solids and dust (0 to 6)

• 0: no protection.
• 1: objects larger than 50 mm, like the back of a hand.
• 2: objects larger than 12.5 mm, like fingers.
• 3: objects larger than 2.5 mm, like tools and thick wires.
• 4: objects larger than 1 mm, like most screws and small wires.
• 5: dust protected. Some dust can get in, but not enough to interfere with operation.
• 6: dust tight. No dust gets in.

The second digit: water (0 to 8, plus 9)

• 0: no protection.
• 1: vertically dripping water.
• 2: dripping water with the enclosure tilted up to 15°.
• 3: spraying water up to 60° from vertical.
• 4: splashing water from any direction.
• 5: water jets from a nozzle, from any direction.
• 6: powerful water jets.
• 7: temporary immersion, up to 1 m deep (tested for 30 minutes).
• 8: continuous immersion beyond 1 m, under conditions the manufacturer specifies.
• 9 (often written 9K): close-range, high-pressure, high-temperature spray-down, the kind used in some washdown and food plants.

An "X" in place of a digit, as in IPX4, means that part wasn't tested or rated. It doesn't mean zero, and it doesn't mean maximum.

The three ratings you'll see most on lighting

• IP65: dust tight and protected against water jets. This is the common rating for vapor tight fixtures in garages, barns, carports, porches, and damp work areas.
• IP66: dust tight and protected against powerful water jets. A step up for areas that get hosed down hard.
• IP67: dust tight and protected against temporary immersion, up to 1 m.

Higher isn't automatically "better" for every job. A rating describes the specific test the product passed, so pick the one that matches the real conditions in the space. And keep in mind that in the U.S., electrical code decides where a fixture can be installed through damp or wet location listings, which are separate from the IP code. Check the product label and your local code for both.

Matching the rating to the room

• Dusty shops (woodworking, feed rooms, storage): a dust-tight first digit of 6 keeps dust off the LEDs and driver.
• Barns, carports, and covered porches: blowing rain and humidity call for a sealed, gasketed fixture. IP65 is the usual fit.
• Car washes, dish rooms, and food processing: if the fixture will be hit with high-pressure or hot-water washdown, look for IP66 or IP69K-rated equipment made for that cleaning routine.
• Ordinary dry indoor spaces (offices, hallways): an IP rating usually isn't needed. Swapping fluorescents for double-ended LED T8 tubes in the existing fixtures is often the simpler upgrade.

Orilis vapor tight fixtures: IP65

Orilis vapor tight LED fixtures are IP65 rated, with a gasketed seal that protects against low-pressure spray of directed water from any angle. They come in 2 ft (36W) and 4 ft (72W) lengths, in 4500K or 6500K only, and are built for damp, dusty, and dirty locations like garages, barns, carports, parking areas, and storage rooms. For indoor fluorescent fixtures in dry spaces, the 4-light fluorescent-to-LED retrofit kit packs four 22W double-ended tubes, lamp holders, wires, and wire nuts in one box. For the bigger picture, read 8 Benefits of LED Lighting That Still Hold Up in 2026.

Safety first

Installing any hardwired fixture is line-voltage work. Turn the breaker off, confirm power is dead with a tester, keep the gaskets and cable entries sealed as the instructions show (a rating only holds if the fixture is closed up correctly), and follow your local electrical code. If you're not comfortable with it, hire a licensed electrician.

Questions?

Not sure which fixture fits your space? Shop vapor tight fixtures or double-ended LED T8 tubes at orilis.com, email info@orilis.com, or call 1-407-900-9745.