For the visor:
https://www.etsy.com/listing/193364395/flexible-metallic-visor-material?ref=shop_home_active_1 (The silver probably gives you what you want)
However, if you actually want it lit, your options are pretty much "fully lit with little-to-no visibility" or "lit from the perimeter which will give more of a edge-glow effect, and only slightly limit your visibility. The fully illuminated effect would probably require an LED field (like Guy-Manuel's Daft Punk helmet) with some kind of diffusion screen placed over it. However, that leaves you unable to see with the helmet on, so it may just have to be a photo op type thing and you carry it around the rest of the time.
Lighting from the perimeter can work, but first you should try something. Take a flash, hold it up to your face with the emitter pointing across (perpendicular to) your field of vision, and turn it on. Take note of the sensation and effect that it has on your eyes, and then imagine that same effect, but from every angle around your face. Your mileage may vary, but my experience is that it is unpleasant. That said, with this option you can leave the helmet on all the time, but just turn the lights on and off when you need them.
I don't want to discourage you, just to give you some realistic expectations. The costume itself is awesome and I would love to see a real-life version of it!