They can only be seen at night when you have them on otherwise nobody knows you have them installed as they are located on the bottom of the car. I have them and hardly turn them on just because its illegal for some stupid reason, distraction issues is what I've heard but there sure of lots of other things that cause distractions and not illegal.
Go neon if you seldom drive on gravel roads or led if you do but they have less light output vs neon.