I've got plenty of hue outdoor lights and It's something you'll actually need when you have more than about 5m between lights. Each of the outdoor low voltage lights come with one of these cables but sometimes you need just a bit more distance. That's when these cables are required. They are more expensive than they should be but at times you will need one. Just a note the max length of a string of lights is 35m you can't use more than 2 of these in a string of 5 lights.