- Your material hierarchy could be wrong (emissive material may be below glass material). - Your model hierarchy could be wrong (extra_ten may be below headlight_l [assuming you're using a model where the headlight is attached to the headlight glass as it should be]). - Your mesh may not be set to an emissive material - Your mesh may have the wrong ID in polygon and / or vertex mode (needs to be 0)
There are other potential causes, start by checking those four items.