These lights are brighter than what I had predicted...just what I needed to place alongside the front of my house. Each spotlight contains 3 (my estimation - 24 lumens) white led. They are easy to install without modification to the pre-wired 10-foot cable, extending the six lights to about 70 feet from the transformer. As long as all lights are installed in a single strum, starting at the transformer, the cables are just fine.
However, in my case, the installation required that the lights be connected going in two different directions...or left and right from the transformer. Also, because I'm using these lights for security (they are that bright), I wanted to install the transformer in a more secure area inside the house.
Here's my solution: I cut the wire about four inches from the transformer and also cut the input connector from one of the lights (left about three inches of wire on the connector and saved it just in case I needed later on). I set all the lights in position and ran the wire underground alongside the house. I then removed an electrical outlet from inside the home and drilled a hole from the inside wall to the outside. I then ran the wire that I had cut from the transformer and the wire from the light I had previously cut through the hole. Using two win nuts, I connected the two sets of wires straight to the transformer (make sure the polarity is correct or the lights won't work). I reinstalled the electrical outlet, making sure the two win nuts splicing the wires to the transformer were behind it and out of site, then installed the wall plate making sure it wasn't so tight as to pinch the wire from the transformer, and then connected the transformer to the wall outlet. Now, the wall outlet was next to a window, this is important to make sure the light sensor, which is attached with a three feet of wire to the transformer, can turn the lights off during the day.
Pease note: Cutting the wire may void the warranty of the transformer or the light you may choose to cut the connector from. But, at least in my case, it was worth it. Also, if you decide to go this route, make sure to connect all the lights and transformer first before cutting the wires. You don't want to cut the wires and then find out that either the light, transformer or both are defective.
12/09/11 Just bought another set of these light to light one side of the house that's unusually dark. I placed the lights facing the window of our master bedroom; this way we can see if anyone is trying to peep through the windows. These lights are an economical way to provide security around the house when the lights are properly placed.