Attached Link: http://www.renderosity.com/viewed.ez?galleryid=554588&Start=1&Artist=danamo&ByArtist=Yes

Hi TobinLam. I had a lot of probs with using cylinder lights for laser effects too. There definitely is a problem in getting them to render consistantly. I finally gave up on using lights and went to using cylinder and cone primitives with variations of the "greenlit" preset from Bryce's complex material category. You can tweak the mat to be any color you want and it renders dependably. Another advantage is that you can use an elongated cone primitive to get that effect of a beam getting narrower with distance. This pic uses primitives for energy beams.