Coastal lighting has to face a far harsher environment than normal garden lighting has to. Salt whipped up from the sea is very corrosive and can quickly cause damage, facts that if you live by the coast we are sure you are already very aware of.
Materials such as marine grade stainless steel, solid brass and galvanised lighting are often the best lighting to choose for these locations. Although more expensive, they often come with longer warranties giving you piece of mind.
Coastal lights also need to fit there coastal location. A little seaside styling can go along way to making a light look like it is mean't to be part of it's surroundings.