this photo is from a restaurant, obsidian, i went to in manchester, england. the over all feel of this restaurant was cool and classy. they achieved this feel with different colors of light in the ceiling, wall and floor. the small vertical slots gave only a glimpse of glow while the opposite wall was hung with red fabric and direct light downwards. this picture gives the feel of the space, dark, intimate and cool. although in other parts of the room may feel more open and cool with other cool lights.
i found this picture on a person's blog and they described using glow-sticks, flashlights along with time-lapse photography to create long streams of light. this type of graffiti would be difficult to reproduced using spray paint to achieve the same affect as the light beams.