The Light My Bricks Star Wars Helmet light kits finish off and compliment these LEGO sets beautifully, and the Stormtrooper Helmet is awesome!
If you are a bit more experienced with LEGO lighting, and willing to spend a little extra time, you can make a couple of minor improvements...
I ran the main and two 'spot-light' power cables up the centre of the stand, completely concealing all cables. There is empty space inside the stand vertical upright, and a technic block with stud holes at the top where you can bring the cables out and through underneath the front of the helmet and into the empty space inside the helmet with the other cables.
I also added an additional bit light to both the left and right aerators to even out the light.
Check out my results in my Speed Build video:
Or if you'd prefer to skip to the Lights:
Everyone who sees these helmets lit up says "Wow! They look awesome!" ;)