headlight relays

Dan,
Hope you continue to read this thread as I have a related question for you. I just purchased a wiring kit from Ron Francis. I am working on a '72 Duster, two headlights. I told them I was installing the GE H6024NH Nighthawks and ordered this relay:
http://www.ronfrancis.com/prodinfo.asp?number=HR-56

I was told that with these bulbs I wouldn't need the relay and therefore didn't get it. What's your take on this? I would much rather have it and be safe than not have it and need a new switch xx months down the road.
Thanks,
C