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

The IP (Ingress Protection) code tells you two things: how well a fixture keeps out solid objects (the first digit) and water (the second digit). For outdoor LED lighting almost every failure we see in the field traces back to a misread IP rating.

What the numbers mean

Code	Protection against water	Typical use
IP64	Splashing water	Sheltered indoor/wet areas only
IP65	Water jets from any direction	Sheltered exterior, under overhangs, covered facades
IP66	Powerful water jets	Exposed facades, coastal buildings, general outdoor use
IP67	Immersion up to 1 m for 30 minutes	Low-level facades, fountains, flood-prone areas
IP68	Continuous immersion at stated depth	Pools, fountains, permanently submerged or buried fixtures

The trap: IP65 is often misapplied

IP65 is frequently specified for fully exposed facades because it is the cheapest option that "sounds waterproof". In practice, wind-driven rain on a tall facade behaves like a sustained jet, and years of thermal cycling will slowly work on any weak gasket. For anything permanently exposed and difficult to service, specify IP66 as a minimum.

IP67 and IP68: about immersion, not weather

Interesting fact: a higher second digit does not automatically mean better weather performance. IP67 and IP68 are tested for immersion, which is the right test for buried or submerged fixtures — but a fixture marketed as IP68 without proper gasket and cable-entry design can still fail in UV and salt spray. Always ask about the housing material and anti-corrosion coating as well.

Three things that matter as much as the IP number

Gasket material: silicone outlasts foam and EPDM in UV and heat cycling.
Cable entry: a proper IP-rated connector beats a gland and sealant every time.
Structural waterproofing: some designs seal the optical chamber independently, so even if the housing takes water the LEDs stay dry.

Quick recommendation

Covered facade or canopy: IP65. Fully exposed facade, bridge or tower: IP66. Ground-level or splash zone: IP67. Submerged or buried: IP68. Coastal and marine environments: add anti-corrosion specification on top of the IP rating, because salt is a separate problem from water.