A lantern that shrugs off a wet autumn in the city can look tired within a single season on the coast. Rain you can plan for. Salt air you have to keep up with. Wind-driven rain finds the one gasket that has gone hard, and a film of salt keeps the same metal damp long after the shower has passed. None of this is a reason to give up on outdoor lighting — it is a reason to choose it, and look after it, with a little more care than a porch light strictly needs. What follows is the working checklist for exposed terraces, garden walls and seaside entrances: seals, finishes, drainage, IP ratings, and the small routines that keep water on the outside where it belongs.

Start With the IP Rating, Not the Photograph

The IP number tells you what the enclosure was built to keep out. Two digits: the first covers solids such as dust and sand, the second covers water. Outdoors, the second digit does most of the work. IP44 handles splashes from any direction and is reasonable for a fixture tucked under a deep eave or a roof overhang. Anything fully exposed — a gatepost, a wall that takes the weather head-on — should be IP65 or better, where the housing is dust-tight and survives low-pressure water jets. IP66 adds pressure; IP67 allows a brief immersion, which matters more for ground-level bollards than wall lanterns.

Read the label rather than the catalogue photo. A good number of handsome lanterns are indoor pieces with a decorative cage, and IP20 means exactly that. It is also worth remembering that a rating describes the fixture as it left the factory and correctly assembled. One missing O-ring, or a cable entry gland left hand-tight, and your IP65 lantern is effectively an open box with a bulb in it.

Seals and Gaskets: Small Parts, Heavy Lifting

Water almost never enters through the glass. It enters at the joints — the frame-to-glass gasket, the lamp holder seal, the cable gland, and the screw holes that hold the whole thing together. Silicone and EPDM gaskets last years in UV and salt; cheap rubber goes hard and shrinks, and once it has, no amount of tightening will bring the seal back.

Test a gasket by pressing it with a thumbnail. It should spring back and feel slightly waxy, not crumble or stay dented. Clean the seating channel with a soft brush before refitting anything — grit trapped under a gasket becomes a leak path. A thin smear of silicone grease keeps rubber supple; avoid petroleum jelly, which softens and swells many rubbers over time. When you close a lantern up, tighten screws in a cross pattern, snug rather than fierce. Overtightening distorts the frame and creates the gap you were trying to prevent.

Finishes That Survive Salt

Powder-coated aluminium is the sensible default for most gardens: light, rust-free, and easy to recoat. On a seafront, marine-grade 316 stainless steel and solid brass or copper earn their keep. Brass will patina, and that is fine; what you are watching for is green crusty bloom around joints, which means moisture is sitting where it should not. Painted mild steel is the one to avoid in coastal air, however attractive the price.

Check the fixings as carefully as the body. Stainless screws threaded into an aluminium lantern can set up galvanic corrosion, especially when salt water bridges the two metals. A nylon washer or a dab of anti-seize compound under the head prevents it. Once or twice a year, clean the surface with fresh water and a soft cloth, let it dry fully, and apply a thin coat of non-abrasive wax. That single habit does more for a coastal lantern than any other ten minutes you will spend on it.

Let the Water Leave

A lantern that drains well is a lantern that dries. Look for weep holes at the lowest point of the housing or base, and never paint, silicone or caulk them shut — they exist precisely because condensation forms inside on cool nights. When mounting, check that the head sits at the highest point of the assembly so water runs away from the door rather than into it, and give the supply cable a drip loop before it enters the gland. Glands should point down or sideways, never up.

Hollow posts and pedestal bases deserve a look too. Water that pools inside a post will eventually find the wiring. Drill or clear a drain if the manufacturer provides one, and clear fallen leaves and grit from the base each autumn.

The Coastal Routine

Salt holds moisture against metal long after the weather has cleared, so a rinse is the single most valuable habit. In an exposed position, take a soft cloth and fresh water to the lanterns once a month through the wetter half of the year, more often if you can see spray on the windows. Work in shade rather than direct sun so the water does not flash-dry and leave deposits. Dry with a cloth, then glance at the fixings, the gasket line and the glass for chips.

A Seasonal Walkaround

Twice a year — early autumn and again after the worst of winter — set aside twenty minutes and go through the same sequence:

1. Switch the circuit off at the breaker before touching anything.
2. Wipe the glass and check for hairline cracks at the fixing points.
3. Open the fixture and look for water marks, white mineral tide-lines or green corrosion on terminals.
4. Press-test every gasket and replace any that has hardened.
5. Clear weep holes, vents and the base of leaves and grit.
6. Check that glands are tight and cables still have their drip loop.
7. Test fixing screws for play and look for galvanic crusting.
8. Touch in any paint chips on aluminium with the manufacturer's matching pen.
9. Reassemble with screws snugged in a cross pattern, then restore power and check the lamp.

Keep a note of dates and of any gasket you have replaced. It sounds fussy; it saves you from wondering whether the seal you are looking at is two years old or seven.

When to Repair and When to Replace

Gaskets, screws, a chipped lens, a tired finish — all straightforward and worth doing yourself. Water inside the wiring chamber is a different matter. If you find moisture around the terminals, brittle or discoloured insulation, corroded contacts, or a breaker that keeps tripping, isolate the circuit and leave it to a qualified electrician. Outdoor lighting sits in the worst conditions a domestic circuit ever sees, and damp wiring is not a job for a screwdriver and optimism.

Everything else is maintenance, and maintenance is mostly rhythm: a rinse after salty weather, a wipe in autumn, a quick check of seals when you change a lamp. Do that, and a good lantern will outlast the fence it hangs on.

Photo: MasashiWakui / Pixabay