What finish is most durable for outdoor wall lights?

Powder-coated aluminium wins on durability because the coating is fused to the metal in an oven at around 200°C, forming a skin far tougher than wet paint. It resists chipping, UV fade and the salt-laden air that strips cheaper finishes within two or three winters. Stainless steel in grade 316 is the only close rival, and it costs more for equivalent corrosion resistance. When specifying outdoor wall lights for a coastal property, we rule out chrome and polished finishes entirely — they pit within a season near the sea. Powder-coated aluminium also tolerates thermal cycling well, expanding and contracting without cracking the coating, which is exactly what a fitting mounted on a south-facing brick wall endures across a British year. Check the specification sheet for a stated coating thickness of 60 microns or more; anything thinner is a wet spray pretending to be powder coat.

The finish and the IP rating do two different jobs, and you need both done properly. The coating protects the housing from corrosion; the IP rating protects the internals from water and dust ingress. An IP65 fitting in powder-coated aluminium, such as the Baker Street black LED wall light, survives direct rain and jet washing, which is why we specify it for gable ends and open exposures. IP44 is the minimum for covered locations such as a porch ceiling or a recessed doorway, and the Usto silver LED wall lamp sits comfortably in that zone. Never rely on a premium finish to compensate for a low IP rating — a beautifully anodised IP20 fitting will fail in the first sustained downpour. If you are running new cable to the fitting, check the condition of the existing circuits first; the NICEIC's guide to rewiring your home explains when aged wiring should be replaced before you hang new fittings on it.

Grade 316 stainless steel, sometimes called marine grade, contains molybdenum, which is what stops chloride pitting in salt air. Grade 304 will rust near the coast, so the grade number matters more than the words stainless steel. Powder-coated marine-grade aluminium is the pragmatic choice for most coastal installations: it resists corrosion almost as well, weighs less, puts less strain on fixings and costs noticeably less. Whichever metal you choose, insist on stainless fixings to match — a galvanised screw in a stainless backplate corrodes first and stains the finish below it. Rinse fittings down with fresh water twice a year in exposed coastal sites; salt crust is what actually starts the decay, not the weather itself. For inland properties, standard powder-coated aluminium is more than adequate, and the money saved is better spent on a higher IP rating or a better light source.

Maintenance requirements differ sharply by finish, and they should influence your choice as much as appearance does. Powder-coated aluminium needs one wash a year with warm soapy water and nothing else. Brushed stainless steel needs twice-yearly cleaning in coastal areas to remove salt deposits, always wiping with the grain. Brass develops a patina that some people want and others do not; left alone it greens, lacquered it stays bright but the lacquer eventually flakes. Painted and plated finishes need inspection every autumn for chips and rust bloom, because a breach in the coating spreads fast once water gets underneath. Check the seals and gaskets at the same time, since a failed gasket lets water in regardless of how good the finish is. If you are extending an outdoor circuit or pairing lighting with solar or EV charging work, the NICEIC's guidance on renewables and home electrics covers the certification an electrician should provide for that work.