I agree with Greengoose. We have them on our 9120s and 9320s, and we love them. I would make it standard on every tractor if i had my way. I wish there was some kit that u could get to replace older combines with the HID lights. Definitely worth the extra money.
I have it on the 9860 that I ran this fall. It is a big improvement from the standard lights. I would never order another one without it. From talking to the mechanic, he said it is possible to retrofit the older combines with that light.