It's been my experience that brass gets pits in the weather. Are you able to shop in person at a lighting store in your area? If so, I'd rely on their advice for what weathers best at the beach.

In fact, led vapor tight fixtures are ideal for installation in garages because of their high level of protection, which is waterproof, dustproof, and corrosion-proof. If you need to install it on an outdoor wall, led wall pack lights are also a good choice because they have a protective enclosure. These two kinds of outdoor lighting LED lamps are energy-efficient and durable and can be used for more than five years.

In addition, there is another kind of post top lights which is similar to the link you posted, and the price is cheaper. You can check it online

http://www.kili-led.com/led-post-top-light.html

You can learn about this kind of lights in your local online store, hope the suggestions will help you

I worked in a lighting store in So Cal. for 12 years. Maris Lighting would be my go to brand. But anything solid brass or copper will work ..........$$$$$$$ attached. That being said the above comment about pitting and weather is correct, but patina is part of the look, oil rubbed bronze fixtures that are acid treated to last a few years but you will get pitting and verde over time. NOTHING stops mother nature. You will notice one side of your house vs. the other will transition faster. However, they will not rot, rust or fall apart they will age with the house.

Murray fiess is made in China, and even when its brass its not really if you get what I mean. avoid that.

The only other option would be the hard resin/stone mix fixture that are made by Maxim lighting they also might fade over time but will not decay

http://marislighting.com made in orange county ca.

https://www.maximlighting.com/vivex

That cira light does not say what the material is? It may have a great powder coat, but sea air is 'extreme" so I am not sure what they are coverig here.

My final note: when you can afford better quality do it...