I made two types of LED Spots for my yard. 9V battery powered and power via old wall wart from a portable phone or dead mp3 player. Got a drawer full of 'em. The 9V ones have been running from dusk till 11 pm for several nights, probably need batteries this weekend. Nice thing is they don't require cords and can be placed anywhere you need light. I'm waiting for my order of UV LEDs for the next batch.
Hope the pics are self explanatory. Be sure to follow all codes and electrical safety regulations. Here's a link for LED resistors and schematics per your voltage selection and choice of LED's. http://led.linear1.org/led.wiz
for Sgt Dr Pepper : here's a photo taken in the basement, it's raining hard outside now. I'll get some yard shots when it clears up. I don't know what you can tell from this picture, but the spots work great outside in the dark when placed anywhere from 3' to 6' away from the target. The LED's are 20 degree spots so the field is narrow. 4 or 5 LED's in each spot.
The little blue pinpoints of light are 4 LEDs mounted on a PVC collar that screws onto the output side of my vortex fog chiller, makes the fog bright blue for about 4 or 5 feet out into the yard, very cool looking. Powered by a 9V