this line i think i don't remember exactly as it was quite some time ago when we last played with this together with maryus.. but you should simply try changing them all and see what does what i never had time/need to play around with it
also you'll notice in my mods i've used 2x different ones one for front(white orb) one for rear (orange orb) the orb colour as far as i can remember was changed with this
diffuse 1.000 1.000 1.000 1.000
no way can i tell how we changed it from red to white but you need to experiment again :o