WHY DOES IT GLOW?

Original game has some cool effect in it. I talk about this:

Some visors are glowing in the dark:

It's Marques/Young (glows Green), Alonso (Green) and Bernoldi (Orange):

I've looked at the textures and found nothing special about them. So, what does determines the visor glowing? Can it be impemented in non-default helmets textures?

___________________________________________________________________________
For a list of EVERY download for GP4, look here:[docs.google.com]