Every outdoor LED project starts with the same line in the spec sheet: IP65. And every outdoor LED project that fails early fails for a reason that has nothing to do with that number.
I work on the supply side, so I see both ends: cabinets leaving the factory with a test report attached, and the same cabinets two or three years later when a buyer sends photos of water staining on the modules and asks what went wrong. The gap between those two moments is where IP ratings stop being useful and installation reality starts.
Here is what actually determines whether an outdoor screen survives.
The rating covers the cabinet, not the wall
IP65 means dust-tight, protected against water jets. It is measured on a sealed cabinet in a test chamber. It says nothing about the seam between two cabinets, the gap where a cable enters the frame, or the way a service door is closed at 7 a.m. by someone in a hurry with cold hands.
Three places on a real installation are outside the scope of the test:
- Cabinet-to-cabinet joints. Two IP65 cabinets bolted together are not automatically an IP65 wall. Water runs down a facade, finds the vertical seam, and sits there. Whether it enters depends on the gasket profile and on whether the installer compressed it evenly — not on the number on the label.
- Cable entries. A rated cabinet with an unrated gland is an unrated cabinet. Ask what the power and data connectors are rated to, and whether the gland is part of the delivered kit or something the contractor buys locally.
- Service access. Every rear door, every front module, every hinge is a seal that gets opened. A cabinet that is sealed perfectly at the factory and opened twelve times in its first year is only as good as the person who closed it last.
Compression, not material, is what ages
Gaskets do not usually fail because the rubber was cheap. They fail because the compression was wrong from day one: over-tightened at the corners so the profile flattens and takes a set, under-tightened in the middle so water tracks along the frame, or tightened in a random order so one side of the door sits proud.
On a well-built outdoor cabinet — the AS6 series we make is a front-and-rear service box with a double-door rear, sealed with a continuous gasket — the practical details that matter are unglamorous: a torque sequence printed on the door, a gasket channel that holds the profile in place while the door swings, and a latch design that pulls the door down evenly instead of clamping one edge first.
If you are comparing quotes and both datasheets say IP65, these are the questions that separate them:
- Is the gasket a continuous molded profile or a cut-to-length strip with glued corners?
- Is there a defined torque and sequence for closing the rear doors?
- Are there drain paths at the bottom rail, so water that does get in can leave?
Question 3 is the one most buyers never ask. A cabinet with no drain is a cabinet that stores water.
Condensation is the failure mode nobody puts on a datasheet
Water does not only come from outside. An outdoor cabinet heats up in the afternoon and cools at night. Air inside contracts, and moist air gets pulled in through every imperfect seal, then condenses on the cold metal and the module backs.
This is why two screens with the same IP rating behave differently in a coastal city and in a dry inland city. The fix is rarely a better rating — it is ventilation design: a breather valve that equalises pressure without letting liquid water in, a layout that keeps the power supply in its own airflow path, and, on larger installations, a proper internal air path rather than a fully sealed box that cooks itself.
On the AS4 outdoor series the same principle applies at the module level: the rear of each module needs to be able to dry, not just stay dry.
What to write into the contract
If you are buying an outdoor wall and want the IP claim to mean something after year one, put these in the documents instead of arguing about it later:
- Which face, which number, tested or declared. Front IP65 with rear IP54 is a common and honest split. A supplier who tells you the split is more credible than one who says "IP65" and stops.
- A water test on the assembled wall. Not on a single cabinet — on a section of the actual installation, with the joints and cable entries in place, before the facade is closed up.
- A closing procedure for service doors, with torque values, handed to the maintenance team, not just to the installer.
- A first-year inspection: one visit at the end of the first rainy season, gaskets checked and photographed, drain paths cleared.
None of this is expensive. All of it is cheaper than replacing modules on a wall that is twelve metres up.
The short version
IP65 tells you the cabinet passed a test in a lab. What keeps an outdoor screen alive is the seam, the gland, the torque, and the drain — the four things that never appear on a datasheet and always appear on an invoice two years later.
If you are specifying an outdoor wall, ask for the split rating, ask for the closing procedure, and ask where the water goes when it gets in. The supplier who can answer all three is the one whose IP65 you can trust.
I work with MuenLED, a China-based LED display manufacturer. Outdoor fixed cabinets: https://www.mlxled.com/product/as6-outdoor-led-screen — outdoor display series: https://www.mlxled.com/product/as4-electronic-led-display
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