Some Fog Lighting/Photoshop help.

[konterganon]

i didnt read the whole tutorial since i think its way too long and much too complicated for what you're trying to achieve but everytime i add light effects, i set the blending mode to add and not to normal. also i wouldnt set the opacity to 255, thats much too high for light effects.
you might also want to try setting the Semi-Transparent colour to the colour of your light.