When you use the halo lamp in Blender to create some form of beams or solid light, you need to remember that Blender is still growing in it's alpha support and the halo lamp has only two settings when it comes to transparent objects: visible and invisible.
This means that you have to know that the light-beams are not going to shine through a transparent object, only the light itself:
Another thing you need to be careful of is reflective materials. When a halo lamps shines through a transparent ...
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