Been playing around with some similar things. If I recall, several of the lighting effects do not work if there is a transparent object in the way. For instance, light cones with shadow effect can not be made to shine through a transmapped object (not with any combination of settings including no "Cast Shadows" and "no light interactions when fully transparent" in the material). Which means, of course, the only ways to get slivers of light falling through a lattice is to build the lattice instead of transmapping it, or use a gel on the light. So...putting the bulb in front of the sun is the simplest answer. Oh, by the way...the lense flare options include a very nice built-in glow effect. Open up the options panel and check out some of the stuff inside!