Introduction
IP rating is one of the most-searched and least-understood specs in commercial lighting. It's a two-digit code, defined by international standard IEC 60529, that tells you how much dust and water a fixture can take before it fails. The problem is most spec sheets list the rating without explaining what it covers, and contractors often default to "higher is better" without understanding what they're actually paying for. This guide breaks down the rating system in plain terms, with application matching for the environments commercial buyers actually deal with: parking lots, building perimeters, gas station canopies, wash bays, and inground installations.
What IP rating means (and what it doesn't)
IP stands for Ingress Protection. The rating is defined by international standard IEC 60529, and it measures two things:
- How well the fixture seals against solid objects and dust
- How well the fixture seals against water
What IP rating does not cover: salt spray, chemical exposure, UV degradation, mechanical impact, or vandalism. Coastal applications need marine-grade finishes in addition to IP rating. Vandal-prone areas need IK rating (impact resistance) on top of IP. Don't assume a high IP number means the fixture is bulletproof to all environmental stresses.
First digit: dust and solid ingress
The first digit ranges from 0 to 6. Higher numbers mean tighter seals against smaller particles.
| First Digit | Protection Level |
|---|---|
| 0 | No protection |
| 1 | Objects larger than 50mm (back of a hand) |
| 2 | Objects larger than 12.5mm (finger) |
| 3 | Objects larger than 2.5mm (tools, thick wires) |
| 4 | Objects larger than 1.0mm (thin wires, screws) |
| 5 | Dust-protected (limited ingress, no harmful effect) |
| 6 | Dust-tight (no ingress) |
For commercial outdoor lighting, you want a 6 in the first digit. Anything less and dust can accumulate inside the fixture, causing thermal stress on the driver and shortening fixture life. Every GKOLED outdoor fixture in our catalog has dust-tight construction (6 in the first digit).
Second digit: water ingress
The second digit ranges from 0 to 9. Higher numbers mean better water resistance.
| Second Digit | Protection Level |
|---|---|
| 0 | No protection |
| 1 | Vertically falling drops |
| 2 | Vertically falling drops with fixture tilted up to 15° |
| 3 | Spraying water up to 60° from vertical |
| 4 | Splashing water from any direction |
| 5 | Low-pressure water jets from any direction |
| 6 | Powerful water jets from any direction |
| 7 | Temporary immersion (1 meter depth for 30 minutes) |
| 8 | Continuous immersion (manufacturer-specified depth) |
| 9 | High-pressure, high-temperature water jets (hose-down) |
For commercial outdoor lighting, the relevant numbers are 5, 6, 7, and 8. Most outdoor fixtures land at IP65 or IP66.
The IP ratings that matter in commercial lighting
A handful of IP ratings cover virtually every commercial application. Memorize these and skip the rest.
- IP20 — Standard indoor dry locations. Offices, retail interiors, warehouses with no moisture exposure. Most troffers and panels carry IP20 because they don't need more.
- IP44 — Light splash protection. Covered porches, lobbies with foot traffic from outside, occasional cleaning exposure. Rare in commercial fixtures.
- IP54 — Dust-protected with splash resistance. Bridge between indoor and outdoor. Some loading dock applications.
- IP65 — Dust-tight, water jet resistance. The standard for outdoor commercial fixtures: wall packs, area lights, canopy lights, most flood lights. Handles rain, sprinkler overspray, and direct hose-down for cleaning.
- IP66 — Dust-tight, powerful water jet resistance. Direct rain in coastal or storm-prone environments, parking structure decks with heavy rinse cycles, food processing exteriors.
- IP67 — Dust-tight, temporary immersion. Inground path lights, fixtures in flood-prone areas, applications where the fixture may sit in standing water briefly.
- IP68 — Continuous immersion. Pool lights, fountain lights, submersible architectural fixtures.
Application matching: which IP rating for which environment
| Environment | Minimum IP Rating | Why |
|---|---|---|
| Indoor offices, retail interiors | IP20 | No moisture or dust exposure |
| Loading docks (covered) | IP54 | Dust, occasional splash |
| Building perimeter (under eaves) | IP65 | Wind-driven rain, sprinkler overspray |
| Parking lots (pole-mounted) | IP65 | Direct rain, dust |
| Gas station canopies | IP65 | Rain, cleaning, vehicle exhaust |
| Building perimeter (exposed) | IP66 | Direct rain in storms, hose-down cleaning |
| Parking structures (deck) | IP66 | Standing water, pressure washing |
| Food processing exterior | IP66 | Aggressive cleaning protocols |
| Car washes | IP66 or IP67 | Direct high-pressure water |
| Inground path lights | IP67 | Standing water from rain and irrigation |
| Pool / fountain fixtures | IP68 | Continuous submersion |
For typical commercial outdoor projects — parking lots, perimeter, area, building exteriors — IP65 is the right answer. Over-spec'ing to IP66 or IP67 in an environment that doesn't need it adds cost without benefit. Under-spec'ing to IP44 or IP54 in an outdoor environment voids warranty when water gets in.
What happens when you under-spec
The failure mode is predictable. Water ingress over weeks or months corrodes the driver, shorts the LED array, or causes thermal cycling that cracks lens seals. The fixture either dies abruptly or starts flickering before it dies.
When a contractor calls in a warranty claim on an outdoor fixture, the first thing the manufacturer does is check whether the IP rating was appropriate for the application. If the spec sheet says IP44 and the fixture is mounted on a building perimeter exposed to direct rain, the warranty claim gets denied. The manufacturer's position is that the fixture was used outside its rated specification.
This is why we recommend IP65 minimum for any outdoor commercial application and IP66 for anywhere with direct water contact. The cost difference between IP65 and IP66 at the fixture level is small. The cost difference at the warranty claim level is the entire fixture.
IK ratings: vandal resistance, separate from IP
IK rating is a separate standard (IEC 62262) that measures impact resistance, scaled 0–10. Higher numbers tolerate larger impacts.
- IK08 — Withstands 5 joules of impact (approximately a 1.7kg object dropped from 30cm). Common minimum for outdoor commercial fixtures in accessible locations.
- IK10 — Withstands 20 joules of impact (approximately a 5kg object dropped from 40cm). Required for high-vandalism environments: school perimeters, convenience store exteriors, transit applications.
IP rating and IK rating are independent. A fixture can be IP65 without being IK10, and vice versa. For commercial applications in vandalism-prone locations, check both ratings on the spec sheet.
Featured weather-rated fixtures
- GKOWPG3 — 70W LED Wall Pack with Photocell. 9,800 lm · IP65 · 5000K/4000K/3000K selectable · DLC Premium. Best for: building perimeter, loading docks, dusk-to-dawn applications.
- GKOALG5 — 100W LED Area Light. 14,100 lm · IP65 · Type III/IV/V distribution · 6KV+10KV surge protection · DLC Premium. Best for: parking lots, large open sites, roadway lighting.
- GKOCP05 — 40W LED Canopy Light. 5,450 lm · IP65 · 5000K · DLC Premium · 5-year warranty. Best for: gas station canopies, drive-through windows, covered parking.
- GKOFDG11 — Selectable Wattage LED Flood Light. Up to 2,050 lm at 15W · IP65 · Knuckle mount · 5000K/4000K/3000K selectable. Best for: façade lighting, signage illumination, security applications.
Key takeaways
- IP rating is a two-digit code: first digit covers dust (0–6), second covers water (0–9).
- IP65 is the minimum for outdoor commercial. IP66 for direct rain and hose-down. IP67 for inground.
- Indoor dry locations are fine at IP20. Don't over-spec.
- Under-specifying IP rating is the most common cause of warranty denials on outdoor fixtures.
- IK rating is separate from IP rating. Check both in vandalism-prone environments.
- Every GKOLED outdoor fixture in our catalog is IP65 minimum and DLC Premium Listed.
Frequently asked questions
What IP rating do I need for outdoor commercial lighting?
IP65 is the minimum for outdoor commercial exposure to rain and dust. Step up to IP66 for direct hose-down environments, parking structure decks, or coastal locations with storm exposure. IP67 is required for inground installations or fixtures that may sit in standing water. Under-specifying IP rating is the most common cause of premature outdoor fixture failure.
Is IP65 good enough for outdoor lighting?
For most outdoor commercial applications — wall packs, area lights, parking lot poles, canopy lights — IP65 is the right specification. IP65 protects against dust ingress and water jets from any direction, which covers rain, sprinkler overspray, and standard cleaning. Step up to IP66 only if the fixture sees direct hose-down or coastal storm exposure.
Does IP rating affect warranty coverage?
Yes. Manufacturers will typically deny warranty claims if a fixture was used outside its rated IP specification. An IP44 fixture mounted on an exposed building perimeter and damaged by water ingress is not a warranty-covered failure — it's user error. Always spec IP rating against the actual environmental exposure.
What's the difference between IP65 and IP66 in practice?
The difference is the intensity of water exposure. IP65 handles water jets — think rain, sprinklers, garden hose. IP66 handles powerful water jets — direct hose-down, pressure washing, storm-driven rain in coastal areas. For typical building perimeter applications, IP65 is enough. For car washes, parking structure decks, or food processing exteriors, IP66 is the right call.
Do indoor fixtures need an IP rating?
Most indoor commercial fixtures are IP20, which covers standard dry locations like offices, retail interiors, and warehouses. Exceptions: vapor tight fixtures for cold storage, food processing, and parking garages need IP65+ even though they're technically "indoor." Confirm the spec on the product page.
What does IP67 vs. IP68 actually mean for inground fixtures?
IP67 handles temporary immersion — 1 meter depth for 30 minutes. Fine for inground path lights and uplights that may flood briefly during heavy rain. IP68 handles continuous immersion at a manufacturer-specified depth — required for pool lights, fountain fixtures, and any application where the fixture is intentionally submerged for extended periods.
Browse weather-rated fixtures for your project
Every outdoor fixture in our catalog is IP65 minimum, DLC Premium Listed, and built to take the weather. Filter by IP rating, application, and wattage to find the right fixture fast.