for each vehicle if you want Colored Xenon lights go into its ini and find these variables 

HASXENONLIGHTS = True //Set to true to enable xeneon lights

LIGHTCOLOR = 11 // light color 


"Blue" =  1  
"Electric Blue" = 2 
"Mint Green" = 3 
"Lime Green" = 4 
"Yellow" = 5 
"Golden Shower" = 6 
"Orange" = 7 
"Red" = 8 
"Pony Pink" = 9 
"Hot Pink" = 10 
"Purple" = 11 
"Blacklight" = 12 
"Stock" = 255 

These colors may only work on Arena War DLC Vehicless