Icicle lights

These are usually white strands of lights that have strands from 1-5 lights hanging down about every foot or so. They look good on the outside of houses and plants such as tall trees. Notorious for having one light go out, and the whole string go out with it. Very expensive. Also very short, so it you need to buy many strings to line a roof. They are also incandescent, so you can't string many of them together, and you need many extension cords to light the whole house!