This image was created using the popular Led Lenser V24, high retail price but good results, now obsolete these are hard to come by and even more expensive than when in production. When on you can chose between a solid colour or have it running through the spectrum. In this case I had it changing colours as I walked with it on either side of the bridge creating a knee high wall of coloured light.
Light wands can be very useful in creating solid walls of light, ribbons of light, light tunnels, spiral/spinners and a huge amount of other techniques can be done with a light wand, you can even make orbs with them. They come in a few different sizes 1/2 meters in some cases, and only 10/20cm in others and they all do something different.