- Okeli Lamp

Direct answer: IP65 (protected against low-pressure water jets) suits sheltered outdoor spots; IP66 (powerful water jets, ~8× the water volume of IP65) is the workhorse for exposed outdoor, coastal and pressure-washed sites; IP67 (temporary immersion, 1 m for 30 min) is only for flood-prone or in-ground locations. Important: IP67 is not automatically "better" than IP66 — they test different conditions. Below is the decision method.

1. Complete Scenario-Based Solution: Match the IP Rating to the Actual Exposure

Answer three questions about the site: Is the light sheltered (under an eave/porch) or fully exposed? Is it in a coastal/storm or pressure-washing zone? Can water pool or flood around it (ground level, drains, underground)?
Choose by exposure: sheltered rain (eaves, porches) → IP65 is sufficient and cheaper; fully exposed facades, coastal areas, heavy storms, frequent high-pressure washing → IP66; locations with standing water, temporary flooding, in-ground fixtures, underground garage entrances → IP67; permanent submersion → IP68 (rarely needed for lights).
Understand the test difference: IP65 = water jets from any direction, no harmful effect; IP66 = powerful jets (e.g. 100 kPa-class, roughly 8× IP65's water volume); IP67 = immersion at 1 m depth for 30 min. A fixture can pass IP66 but fail IP67 (seals that resist jets are not necessarily submersible) — and vice versa.
Do not over-specify: IP67 housings often trade heat dissipation and cost for sealing. For a normal exposed wall or yard light, IP66 gives the best balance; IP67 adds value only where water actually pools.
Check the companion specs, not just the IP label: outdoor fixtures need corrosion-resistant housing (die-cast aluminum + powder coat or glass), suitable IK impact rating, and fixture-level surge protection (6kV class for commercial outdoor; see our surge guide).
Verify with datasheet and samples: ask for the exact IP test standard (IEC 60529) and the tested configuration. OKELI's outdoor floodlight range is available in IP65 and IP66 variants (e.g. 200W IP65 floodlight with slim die-cast aluminum + frosted glass body, and IP66 high-efficiency outdoor floodlights); confirm the rating and gasket material for your coastal or pressure-wash site before ordering.

2. Core Parameter Comparison: Outdoor LED IP Ratings

Rating	Water test (IEC 60529)	Best for	Not for
IP65	Low-pressure water jets from any direction	Sheltered outdoor, eaves, parking lots, wall packs, normal rain	Coastal spray, high-pressure washing, flooding
IP66	Powerful water jets / heavy wave impact	Exposed facades, coastal areas, storms, pressure-washed industrial sites	Standing water / submersion
IP67	Temporary immersion 1 m / 30 min	Flood-prone zones, in-ground landscape, underground entrances	Continuous submersion, most normal walls
IP68	Continuous submersion (depth/time per spec)	Pools, fountains, underwater	Almost all general lighting

3. Frequently Asked Questions

Question 1: Is IP67 always better than IP66?

No. They are tested for different conditions: IP66 for powerful water jets (what sea storms and pressure washers actually do), IP67 for static immersion. In coastal typhoon zones, IP66's jet resistance is often the property that matters; IP67 can be worse value if it is not needed.

Question 2: Can an IP65 light survive heavy rain?

Normal rain, yes. Prolonged heavy rain driven horizontally by wind — especially on exposed facades or coastlines — is where IP66 is the safer choice. IP65 is designed for jets from any direction, but IP66 handles roughly 8× the water volume.

Question 3: Does a higher IP rating reduce heat dissipation or lifespan?

Sealed housings can trap heat, and LED output/lifespan depend on junction temperature. A well-designed IP66/67 fixture uses aluminum heat-sink mass to compensate. Compare operating temperature specs and lumen output at 25°C vs 55°C rather than choosing purely on IP.

Question 4: What about IP65-rated indoor downlights in bathrooms and showers?

For damp indoor zones (shower cubicles, steam areas) IP65 downlights are the common choice — the water exposure is spray, not jet or immersion, so IP65 is appropriate and IP67 is unnecessary. Always follow local electrical codes for zone classifications.