Oh, and i don't know where you live but the reason for wiring the green wire to the high beam circuit is so the lights are only on with the high beams... Why you ask? LAW...
I know most states including here in MN, after doing some extensive research, have laws that you can only have a max of four forward facing lights uncovered, and aux driving lights have to be above a minimum of 16 inches and below a max of 42 inches, and they can only be on with the high beams and have to be off when meeting oncoming traffic.
That's why you wire it that way, so when you go to low beams they turn off, and back on when you go to high beams, that is if you have the switch on which is more of an enable switch then power switch, when its on and you flip to high beams then the Hella's come on. They have the wiring diagram like that to meet state laws.