Lights do not have the glow effect when placed. Sometimes the glow effect is random places in the world. It moves around when you look around

Easiest way to explain is to show you.
First image is a inverted light.
Second image is outside where you can see the glow effect of the lights that are inside the building.
http://imgur.com/49EzlKn
http://imgur.com/fdA8RrG

lamp render rewritten. should be fixed.