I have for a long while now wanted to have a miniature street light that was realistic, unlike most available products. I have been designing a 1:4 scale model of my GE Form 46 Radial wave.
https://www.lighting-gallery.net/gallery/displayimage.php?album=6384&pos=1&pid=222229
 


The design is basic but it is still pretty convincing. I don't have the means to create it myself so I am using 3rd party 3D printing services. I am not scheduled to get my parts until January so I won't have updates for a while. I plan on using G4 lamps to light this fixture likely in LED. I would want to use halogen but I'm not sure if the heat would damage the plastic.

It would be neat albeit expensive to use these as pathway lighting.

More updates will come as I am able to.

The arm has been assembled.

These are the pieces.

Dunno the material you want to use, but if we are talking about the most common FDM, most likely it won't withstand any incandescent without at least proper (heat) reflective surface. But I yhink a selfadhesive aluminum foil would do the trick up to at least few W lamps.
Plus make sure the parts you design are actually physically possible to make, without having to deal with artifacts like support structures or so (mainly worried about the main "radial wave reflector"; this way the bottom surface would be anything but nice). Maybe you would need to split it in halves, then it may be easier to print the whole "head assembly" as just two halves...

Or another option (but dunno if the size allows it): Cut a sheet of aluminum from a beverage can and press the shape into it using 3d-printed 2-part (top and bottom) die. Use higher filler percentage, the two dies have flat backs, so easy to print with good structural strength. The aluminum sheet is soft enough so even the 3D printed die should imprint the shape well. It is better to "sandwich" the dies and the aluminum material between wood blocks and press them together using hammer blow. That way you may stretch the metal way without it cracking.
Or made the pressing two stage: First set of dies forms mainly part of the the middle "cup" section, the second set gives it the final shape.
Such aluminum "reflector" would likely allow even the use of some halogen capsule...