Quick answer: An IP rating's two digits tell you exactly how well a light fixture resists dust and water — the first digit (0–6) covers solids, the second (0–9) covers water. IP20 means dry indoor rooms only; IP44 means splash-proof for bathrooms and covered porches; IP65 means dust-tight and jet-proof for fully exposed outdoor use; IP67 survives temporary submersion. Match the rating to the location before you buy, because the wrong one fails early or, in wet spots, isn't safe.
How to read an IP code
IP stands for Ingress Protection, and the code is defined by the international standard IEC 60529. Every rating has the same structure: "IP" followed by two digits, each tested separately:
- First digit (0–6): protection against solid objects — dust, sand, and physical intrusion.
- Second digit (0–9): protection against water — from light drips up to full submersion.
So IP44 is not "level 44" of anything: it means 4 against solids (objects larger than 1 mm, like small wires) plus 4 against water (splashes from any direction). IP65 means 6 against solids (completely dust-tight) plus 5 against water (low-pressure water jets from any direction). Once you see the two halves, every rating on a spec sheet becomes legible.
What the two digits mean
First digit — solids (0–6). For home lighting you will see a 2, 4, or 6. IP2x blocks fingers and objects over 12.5 mm (basic, dry rooms). IP4x blocks objects over 1 mm, like small wires — the standard splash-zone level. IP6x is completely dust-tight, which is what lets outdoor fixtures survive dusty summers and storms.
Second digit — water (0–9). This is the digit that decides placement. IPx3 handles spraying water (light drizzle). IPx4 handles splashes from any direction (light rain, sink splashes). IPx5 handles water jets (heavy rain, garden hoses). IPx6 handles powerful jets (storms, pressure washers). IPx7 survives temporary submersion — up to 1 meter deep for 30 minutes — and IPx8 handles continuous submersion for pools and ponds. Note the jump from 4 to 5: splash-proof (IPx4) is not full-rain-proof.
IP ratings compared: where each one goes
| Rating | Solids | Water | Put it here |
|---|---|---|---|
| IP20 | Fingers (12.5 mm+) | None | Bedrooms, living rooms, hallways, offices — dry rooms only |
| IP44 | Objects 1 mm+ | Splashes any direction | Bathroom zone 2, kitchens near sinks, covered porches and patios |
| IP65 | Dust-tight | Water jets | Exposed outdoor walls, garden lights, directly above baths and showers |
| IP66 | Dust-tight | Powerful jets | Coastal and high-wind exposure, security lights |
| IP67 | Dust-tight | Temp. submersion (1 m, 30 min) | Ground-level fixtures in flood-prone spots, in-ground path lights |
| IP68 | Dust-tight | Continuous submersion | Pools, ponds, underwater features |
Bathroom zones: the rules, in plain English
Bathrooms are where IP ratings become legal requirements rather than good practice. Zone 0 — inside the bath or shower tray: IP67 minimum. Zone 1 — directly above the bath or shower, up to 2.25 m from the floor: IP65 minimum. Zone 2 — the 0.6 m band around the bath, basin, or shower, up to 2.25 m high: IP44 minimum. Outside the zones, IP20 is technically permitted, but the small price gap makes IP44 the smarter minimum for any bathroom fixture.
In the US the parallel system is UL listings: "damp location" for bathrooms and covered porches, "wet location" for direct water exposure. Check for a real testing-lab mark (UL or ETL), not a self-declared CE label alone.
What an IP rating does NOT tell you
- UV and corrosion: IP65 says nothing about sun damage, salt air, or rust. A coastal fixture needs marine-grade finishes on top of the rating.
- Temperature and ice: ratings test water, not freeze–thaw cycles or extreme heat. Check the operating temperature range separately.
- The bulb vs. the fixture: the IP rating applies to the whole fitting — housing, seals, and connections. A waterproof bulb in an unrated fixture is still an unrated fixture.
Five rules before you buy
- Round up, not down. If a spot is between two categories (a "sometimes exposed" porch), buy the higher rating. Upgrading from IP44 to IP65 costs little; replacing a dead fixture costs a lot.
- Never put IP20 outdoors. No water protection means early failure — and moisture plus electricity is a genuine safety hazard.
- Ground-level means IP67. Path lights and in-ground uplights sit in puddles after storms; IP65 handles rain from above, IP67 handles standing water below.
- If the listing states no rating, assume IP20. Some "outdoor-looking" fixtures have no rating at all.
- Pick the location first. Decide where the light goes, then buy the rating that location requires.
Fixtures that show the ratings in practice
- Arden Hearth Aluminum Outdoor Light — an IP65 outdoor wall light: the textbook pick for an exposed entryway or garden wall that takes rain straight on.
- Alina Dawn Steel Outdoor Light — an IP65 spotlight with a tilting head for uplighting trees and walls.
- Vian Rain Aluminum Floor Lamp — an IP65 outdoor floor lamp, showing that even portable, low-to-the-ground fixtures can carry a serious rating.
- Orla River Alabaster Wall Light — a waterproof, bathroom-tagged wall light: the kind of sealed fixture to shortlist for a bathroom splash zone (confirm the exact IP rating on the product page against your bathroom zone).
For more, see our outdoor light buying guide, the bathroom lighting guide, and the patio, deck and garden guide.
Frequently asked questions
Can I use an IP44 light outdoors in the rain?
Only in a sheltered spot — a covered porch or soffit is fine, but an exposed wall facing storms, sprinklers, or a garden hose needs IP65 or better.
What IP rating do I need above my shower?
Minimum IP65 directly above the bath or shower (zone 1, up to 2.25 m from the floor). Inside the shower tray footprint at low level, step up to IP67.
Does the bulb or the whole fixture need to be IP rated?
The whole fixture: housing, seals, and connections. A water-resistant bulb in an unrated housing does not meet the requirement.
Is IP65 enough for every outdoor light?
For almost everything wall- or ceiling-mounted in the open, yes. Use IP67 where fixtures can sit in standing water and IP68 underwater. IP says nothing about UV or salt corrosion, so coastal fixtures need marine-grade finishes too.
What is the difference between damp-rated and IP44?
Two systems, one idea. "Damp-rated" is a US UL listing for moisture-prone spots like bathrooms and covered porches; "wet-rated" covers direct water exposure. The IP code is the international test result spelling out exactly how much water a fixture resists — a wet-rated fixture will typically read IP65 or higher.