IP65 vs IP67 vs IP68 — Which Rating Do You Actually Need?

What the IP Code Actually Means

The first digit is almost always 6 for outdoor architectural fixtures — fully dust-tight, no dust enters regardless of exposure duration. Any fixture rated IP65, IP67 or IP68 has the same dust protection; the difference is entirely in the second digit, which describes water protection under IEC 60529.

IP65 — When Is It Enough?

IP65 survives water jets projected from a nozzle in any direction — in practice, direct rain and garden-hose spray. It does not cover sustained water pressure from building-facade cleaning machines, road spray from passing vehicles, or any scenario where water pools around the fixture.

IP65 is appropriate only for fixtures mounted in genuinely sheltered positions — under a deep soffit, inside a recessed architectural reveal, or in a protected internal courtyard. For anything exposed to the outdoor environment, IP65 carries meaningful failure risk over a five-year installation period.

IP67 — The Correct Default for Outdoor Architectural Work

IP67 means the fixture can be immersed in water to 1 metre depth for 30 minutes without water entering the housing. In practical terms this covers building facades (heavy rain, typhoon-condition wind-driven rain, high-pressure cleaning jets, ice melt pooling at the mounting point), bridges (road spray, river mist, deck flooding, water tracking along structural elements) and hotel/resort landscapes (tropical monsoon rainfall, irrigation overspray, high humidity).

IP68 — When Submersion Is a Real Risk

IP68 specifies continuous submersion beyond the IP67 limit. There is no single IP68 standard — the exact depth and duration are defined by the manufacturer, so always check the specification: a fixture rated IP68 (3 m / 4 h) is very different from one rated IP68 (0.5 m / continuous).

Specify IP68 for in-ground fixtures in flood-prone areas, below-waterline bridge illumination, and fountain or pool lighting where the fixture operates submerged — always with a manufacturer-specified submersion depth that exceeds the application depth.

For practical guidance on fixture selection and placement around ponds, fountains, waterfalls, and pools, see these landscape lighting techniques for water features.

Coastal and Marine Environments — IP Is Not the Whole Answer

On coasts and in marine environments, IP67 addresses water ingress but not salt-air corrosion. Specify marine-grade surface treatment on aluminium housings and stainless steel fasteners, and verify corrosion resistance under IEC 60068-2-52 salt mist testing. The IP code alone is not sufficient for coastal projects.