The most popular up light in North America, originally designed by Unique Lighting Systems, simple and practical, however, it's not easy to manufacture a simple but qualified outdoor lighting fixture, why LT TECH?
Brass is made from a combination of copper and zinc, it will "patina" or turn darker over times, but it won't corrode, it's the best option for coastal and outdoor environments.
Wipe the brass light fixtures thoroughly with dampened cloth until you see zero dirt or residue, warm water preferred.
You MUST disconnect the power and make sure the work area is dry, then remove the light fixture, untwist the wire connectors and wire ends, connect the new light fixture.
Yes, landscape lighting illuminates dark areas, entries, exits and any dark spots where intruders can hide.