Standard outdoor fixtures, fittings and junction boxes corrode fast within sight of the bay or the ocean. Not over a decade. Over a couple of seasons, which is why the most common thing we get called back to look at is somebody else’s outdoor lighting, two summers after it went in.
Stainless and marine-rated hardware costs more up front and it’s the whole difference. If you are comparing quotes for outdoor work and one is noticeably cheaper, the honest question to ask is what fixtures and what fittings it specifies, because that’s usually where the gap is.
The other thing worth knowing is that outdoor lighting is mostly a wiring job rather than a fixture job. Where the runs go, how they are buried or routed, how the circuit is protected, and on an elevated lot in a flood zone, at what height. The fixtures are the part you see and the smaller part of the work.
Every technician who turns up at your door is background-checked, and we clean up before we leave.