Holy crap that's cool! Is that completely unlit?
How are you doing the 'light beam'?
Yup, no lights!
Emissive color, Concentric cylinders, each one very transparent (like, alpha=0.01) and a linear gradient that multiplies both emissive and opacity along one axis, for the soft fade. It also looks better if I add noise to the texture, since it blends each cylinder into the next one better, but I haven't automated that yet, so it's not in here.