What IP rating do I need for outdoor lights?

It depends entirely on placement. Under a covered porch or a deep eave, IP44 is adequate — it handles splashing but not driving rain. For anything standing in a garden bed, on a path or on an exposed wall, IP65 is the sensible minimum, because it is sealed against water jets from any direction. For a light recessed into paving, a deck or the ground where water can pool over it, you want IP67, which survives temporary immersion. Fully submerged pond and fountain lighting needs IP68.

What is the difference between IP65 and IP67?

The second digit describes water protection, and the two ratings protect against different things. IP65 is tested against low-pressure jets from any direction — driving rain, a sprinkler, a hose — but not against being underwater. IP67 is tested by immersion in about a meter of water for 30 minutes, which covers a fixture that sits in a puddle or under snowmelt, but it is not necessarily tested against pressurized jets. In practice most quality IP67 outdoor fixtures handle rain fine, but if a fixture will be both blasted and submerged, look for a dual rating such as IP65/IP68.

IP65 is water-resistant rather than waterproof, and the distinction matters. It means the enclosure repels water projected from a nozzle at any angle — rain, sprinklers, a hose rinse — without harmful ingress. It does not mean the fixture can sit in standing water. An IP65 path light in a bed that floods in a storm, or an IP65 deck light in a spot where snowmelt pools, will eventually take on water through the gasket. For those placements move up to IP67.

Do IP ratings degrade over time?

Yes, and this is the part manufacturers do not advertise. The rating is measured on a new fixture. Rubber gaskets harden and shrink under UV and temperature cycling, lens adhesive lets go, and threaded seals loosen with freeze-thaw movement, so a genuine IP65 fixture at year one can behave like IP44 at year five. It is the single most common route to the misted lens and dead LED that owners report in year three. Buying a step above what the placement strictly needs is cheap insurance.

Does an IP rating cover UV, salt and freezing?

No. IP addresses solids and water ingress only — nothing about ultraviolet degradation, salt corrosion, impact resistance or temperature range. A cheap fixture can carry a genuine IP67 rating and still go chalky and brittle after two summers of sun, or corrode within a season in a coastal yard. For those you want separate indicators: UV-stabilized polycarbonate rather than plain plastic, marine-grade brass, copper or 316 stainless in coastal locations, and a stated operating temperature range if you get hard winters.

Outdoor Lighting IP Ratings Explained: IP44 vs IP65 vs IP67

Written & researched by Elena Marsh Gardening & Landscaping Editor

Updated October 2026

Over-the-shoulder view of a person pushing a small path light into garden soil at dusk, warm glow

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The short answer: IP is a two-digit code — the first digit is protection from solids (dust), the second from water. Outdoors, the second digit is what matters. Use IP44 only under a covered porch, IP65 for anything in a bed, on a path or on an exposed wall, IP67 for fixtures recessed into paving, decking or the ground where water can pool, and IP68 for anything submerged in a pond or fountain. When in doubt, go one step higher than the placement strictly requires.

What the Two Digits Mean

IP stands for Ingress Protection, defined in an international standard. The first digit rates protection against solid objects, from a finger down to fine dust. The second rates protection against water, and it is a graded scale where each level is a defined laboratory test rather than a marketing claim.

First digit (solids)	Protects against
0	No protection
1	Objects over 50 mm — a hand
2	Objects over 12.5 mm — a finger
3	Objects over 2.5 mm — a tool, a thick wire
4	Objects over 1 mm — most wires and screws
5	Dust protected — some ingress allowed, but not enough to interfere
6	Dust tight — no ingress at all

Second digit (water)	Test	What that means in a yard
0	None	Indoor only
1	Dripping water, vertical	Effectively nothing outdoors
2	Dripping at up to 15° tilt	Still indoor-grade
3	Spraying water up to 60° from vertical	Light rain under shelter
4	Splashing from any direction	Covered porch, deep eave, under a pergola roof
5	Low-pressure jets from any direction	Driving rain, sprinklers, a hose rinse
6	Powerful jets	Storm-driven rain, pressure washing nearby
7	Immersion to 1 m for 30 minutes	Standing water, puddles, snowmelt pooling
8	Continuous immersion, depth per manufacturer	Pond, fountain, pool niche

Two quirks are worth knowing. The scale is not strictly cumulative at the top — a fixture rated IP67 has been immersion tested but not necessarily jet tested, which is why serious outdoor fixtures sometimes carry a dual rating like IP65/IP68. And an X in place of a digit, as in IPX4, means that property simply was not tested, not that it scored zero. IPX4 tells you about water and nothing about dust.

Wide view of a person pushing a small path light into garden soil at dusk, warm glow

Which Rating a Given Placement Actually Needs

This is the table that matters. Ratings below are the sensible minimum; going one step higher is rarely wasted money because seals degrade with age.

Placement	Minimum rating	Better choice	Why
Covered porch ceiling, deep eave	IP44	IP65	Sheltered from direct rain but not from wind-blown spray
Exterior wall lantern, open wall	IP44	IP65	Driving rain hits a wall from the side, not vertically
Path light staked in a bed	IP65	IP65	Sprinklers and rain from every angle
Spotlight uplighting a tree	IP65	IP67	Aims upward, so the lens collects standing water and debris
Step light recessed in a riser	IP65	IP67	Splash-back and snowmelt against the riser face
Deck light flush in the boards	IP67	IP67	Water pools on a flat deck before it drains
In-grade well light in paving or turf	IP67	IP67/IP68	Sits in a low spot; irrigation and rain collect over it
Fixture in a bed that floods in storms	IP67	IP67	Temporary submersion is routine, not exceptional
Pond edge, splash zone of a fountain	IP67	IP68	Water level rises and falls; splash is constant
Submerged pond or fountain light	IP68	IP68	Continuous immersion is the only test that applies
Pool niche lighting	IP68	IP68 plus a listing for pool use	Chemistry and bonding requirements go beyond IP
Transformer on an exterior wall	IP44 minimum	IP65, mounted 12 in above grade	Splash-back off paving is the usual killer
String lights over a patio	IP44	IP65	Exposed to rain; connectors are the weak point
Cable connectors, buried	Sealed / gel-filled	Sealed / gel-filled	IP is rarely quoted here; use gel connectors regardless

The In-Grade and Uplight Trap

Two placements catch people out repeatedly, and both share the same physics: an upward-facing lens becomes a bowl.

An uplight aimed at a tree collects rain, irrigation, leaf litter and mulch on its lens. Even where the fixture drains, a rim of debris holds a shallow puddle against the gasket for hours after every storm. Fixtures that would be perfectly happy on a wall at IP65 start weeping into the housing after two or three seasons in this position. Choose IP67 for uplights, tilt them slightly off vertical where the effect allows so water runs off, and clear the debris that collects around the base each fall.

In-grade well lights are worse, because they are set flush with paving or turf in what is by definition a low point. Everything that runs across the surface runs over the fixture. Beyond IP67, look for a specified drainage arrangement — a gravel bed under the housing, a weep path, or a driver mounted remotely rather than inside the sunken can. A well light with the driver in the buried housing is a fixture that fails the first time the seal ages.

Wide environmental view of a person pushing a small path light into garden soil at dusk, warm glow

Ratings Age — Plan for It

An IP rating is measured once, on a new unit, in a laboratory. The yard does not respect that. Four mechanisms erode a seal:

UV hardening of gaskets. Rubber and silicone stiffen and shrink over years of sun exposure, so a compression seal that was tight at installation loses contact pressure.
Thermal cycling. A fixture that runs warm at night and cools by dawn breathes — air, and eventually moist air, is drawn in and out past any imperfect seal. This is why a fixture with no visible leak can still fog inside.
Freeze-thaw. Water that has entered a threaded joint expands as it freezes and works the joint open a little more each cycle.
Adhesive failure. On sealed-lens LED fixtures, the lens is often bonded rather than gasketed, and that bond has a finite life under UV.

The practical consequence is that the misted lens and dead LED in year three, a recurring complaint across owner reviews of budget outdoor fixtures, is very often a seal that aged rather than a rating that was fake. Two responses help: buy one step above the strict requirement, and prefer fixtures with a serviceable gasket and a replaceable lamp over a fully potted sealed unit, because the sealed unit is disposable by design.

What IP Does Not Cover

IP is a narrow specification and reading too much into it is the second most common mistake here. It says nothing about:

Hazard	What to look for instead
UV degradation	UV-stabilized polycarbonate, powder-coated metal, glass lens rather than acrylic
Salt corrosion	Marine-grade brass, copper or 316 stainless; avoid plated steel near the coast
Impact (mowers, kids, hail)	An IK rating if published; metal housing; glass over thin acrylic
Freezing temperatures	A stated operating range; lithium cells outperform NiMH in cold
Wet vs damp location suitability	A UL or ETL listing marked "suitable for wet locations"
Corrosive soil and fertilizer contact	Brass and copper stakes; avoid bare aluminum in heavily fertilized beds

In the US market the UL or ETL wet/damp location listing often tells you more about real-world suitability than the IP figure, because it is a safety certification tied to installation code rather than a self-declared marketing number. Many quality fixtures carry both. A fixture with neither, sold with a large IP claim in the title and no certification mark, deserves suspicion.

Judging a Claim You Cannot Verify

IP figures on inexpensive listings are frequently self-declared and occasionally optimistic — the same housing appears under several brand names with two different ratings. Since you cannot test the seal from a product page, the useful signals are indirect:

Look at the seam design in the photos. A visible compression gasket and machine screws is a better sign than a smooth glued joint on a cheap fixture.
Look for a glass lens. Glass resists UV and scratching, and it usually accompanies a more serious housing.
Look for a serviceable battery compartment on solar fixtures — a sealed unit means the whole fixture is disposable when the cell fades, and a gasketed screw-down compartment is a sign the manufacturer expects the fixture to last.
Read the year-two and year-three reviews rather than the recent ones. Water ingress is a slow failure, and it shows up in reviews written twenty months after purchase, not twenty days.

That last one is the most useful filter available and it is exactly how the fields in best solar landscape lights and best low-voltage landscape lights are weighted — long-term reports about condensation, seal failure and corrosion carry far more weight than first-week impressions of brightness, because brightness is obvious on day one and sealing is not.

If Water Already Got In

A fogged lens is not always terminal. If the fixture is serviceable, open it on a dry day, dry the interior completely, clean the gasket seat, and replace or lightly grease the gasket with silicone dielectric grease before reassembling. Add a small silica gel packet inside if there is room. For a fixture where the lens is bonded, a bead of clear silicone around the lens rim buys a few more seasons but is a repair rather than a fix.

Prevention is cheaper than any of that. Site fixtures where water drains away rather than collects, keep mulch below the base rather than piled over it, tilt uplights slightly so the lens sheds, and wipe lenses twice a year — which also recovers the surprising amount of output that dust and pollen quietly absorb.

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Outdoor Lighting IP Ratings: What Each One Really Survives