IP68 and IP69K are the two ratings you will meet on every industrial LED work light datasheet. Most buyers assume IP69K is simply "IP68 but better."
It is not — and specifying the wrong one is an expensive mistake. The two ratings test completely different hazards.
We manufacture IP69K-rated work lights and hold third-party IEC 60529 test reports for them, so we see the failure mode this confusion causes: lights that survive submersion, then die at the first pressure wash.
Below is exactly what each test measures, why IP68 seals fail under a washdown, and a simple rule for deciding which rating your application needs. Let’s break it down.
The short answer: IP68 = protection against still-water submersion. IP69K = protection against 80°C water jets at 80–100 bar — a pressure washer. If your equipment ever gets pressure-washed, you need IP69K.
What IP Ratings Actually Measure
The IP (Ingress Protection) code is defined by IEC 60529. Two digits: the first rates protection against solids (dust), the second against liquids.
A first digit of 6 means completely dust-tight. Both IP68 and IP69K share it, so both give total dust protection.
The difference is entirely in how each rating tests water.
IP68: Submersion in Still Water
The IP68 test submerges the product in still water at a declared depth and duration. A common specification is 1 metre for 30 minutes; deeper and longer are permitted.
IP68 is designed for temporary submersion (a river crossing on agricultural machinery), splash and rain, and outdoor storage.
What it is not designed for: high-pressure water jets.
IP69K: High-Pressure, High-Temperature Water Jets
The IP69K test (originally DIN 40050 Part 9, now ISO 20653) simulates an industrial washdown: water at 80°C and 80–100 bar, 14–16 litres per minute, sprayed from four angles — 0°, 30°, 60° and 90°.
That is a commercial pressure washer, replicated in a lab. A product that passes can take daily washdowns without seal failure.
Why IP68 Fails Under Pressure Washing
The physics are straightforward.
IP68 seals hold against hydrostatic pressure — the weight of water sitting above the seal. A pressure washer delivers dynamic pressure at a single point, an order of magnitude higher than the same seal ever sees under water.
So a directed jet can force open a seal that sailed through its submersion test. This is why agricultural equipment, construction machinery, food processing lines and car washes specify IP69K, not IP68.
Which Rating Does Your Application Need?
Require IP69K
- Agricultural tractors and harvesters — regular high-pressure washdowns
- Construction machinery — power washing to remove concrete and mud
- Food and beverage processing equipment — hygiene washdown regimes
- Car wash and vehicle cleaning installations
- Any equipment maintained with a pressure washer
IP68 Is Sufficient
- Marine deck and underwater lighting
- Rain and splash environments with no pressure washing
- Temporary immersion scenarios
Both Ratings Together
Some equipment operates underwater and gets pressure-washed. Products certified to both standards exist — specify both, and ask for both test reports.
Verifying the Rating: What to Ask Your Supplier
A legitimate IP rating is backed by a third-party test report from an accredited laboratory — not a line on a spec sheet.
Ask for the IEC 60529 report. It shows the exact test conditions, the laboratory, and the pass criteria. No report? Treat the claim as unverified.
All Tough Lighting IP69K products are tested to IEC 60529 by accredited third-party laboratories. Test reports are available on request.
Specify With Confidence
One question settles the choice: will this equipment ever meet a pressure washer? If yes, IP68 is not enough — whatever the depth rating says.
Browse our IP69K-rated LED work lights, or
send us your application details — we’ll confirm the right rating and share the test reports before you commit to an order.
