See how this cheap light can adjust to make the beam so tight that it will project an image of the emitter on a distant surface? It seems pretty neat as I can light up something surprisingly far away.
Now this light is not good enough because it is not constant brightness, does not have an optical coating, is not water proof, and mine arrived defective with the clip screwed on at an angle - but does anyone make a higher-end light with a very narrow beam due to using a lens? I am not sure I even care if you can adjust it.
http://www.amazon.com/gp/product/B006E0QAFY/?tag=cpf0b6-20