I decided to give these LED strips a try on my 18"K-Line circus cars and for about $7 a piece you can't go wrong. The strips come with peel and stick tape and you can put them on the roof of the car. The resistor is already installed with a hot and ground wire. I took a piece of 3/16" heat shrink tube and covered the resistor just as a safety. The 2 wires just to keep the install neat I put a length of 1/16"heat shrink on the length of the wires except for about 2" at the end to attach to my power source. After sticking the LED strip to the roof I soldered in my two wires into the existing hot and ground in the car. My cars have silhouette figures so I decided to cut a strip of wood from the craft store and hot glue it down over the old sockets that use to house the bayonet bulbs. I took some "Duct" brand reflective tape and put it on the wood strip for the LED's to reflect off of.The strip of wood can not be seen threw the frosted windows. The strips for the money work well. They could maybe be a tad brighter but still a good glow under lower light levels. For a more economical way to have LED's in you passenger cars or where ever you want a little extra light. Here are some pics of what I used. Here is what the cars look like with no flash on the camera.