I use LED landscape lights exclusively, and in ten years, they have never let me down. And I don't mean those barely visible solar lights that charge during the day and emit a few photons when it gets dark. These lights are high-wattage (0.5 to 2.0 watts), extremely bright, and require a transformer, like regular lights.
For comparison, a 0.5 watt LED bulb is about the same brightness as a 13- to 20-watt incandescent bulb. The 2.0-watt LEDs are bright enough to use in an upward configuration to illuminate the 20-foot pillars on my porch. If you've ever seen a 2-watt LED flashlight, then you know how incredibly bright they are.
They've never failed me.
Mine are pretty old, and I can't find the same ones anywhere, but here's something similar:
http://shop2.aol.ca/shop/product--catId_1001233__locale_en__productId_5319114.html
Mine are Westinghouse as well, but they're copper, with a more colonial styling.
You can also convert your existing landscape lighting to use LED bulbs:
http://www.superbrightleds.com/malibu.htm
I even converted the exterior carriage lights on my barn to use 3-watt LEDs, and they look like they have 40-watt bulbs in them.
LEDs use a lot less power for the same brightness as incandescent bulbs. Each of my strings of 15 lights uses only 10 watts of power -- less than the power required for a single 11-watt bulb from a normal landscape lighting kit.