Originally Posted by ChrisL_
I stand corrected! I have not even started and am already in trouble
Not sure if it a big deal or not. I took a trip out to our LHBS to pick up all of my supplies. I was looking for the Hallataur and saw New Zealand Hallataur instead of a North American variety. The Alpha is 6.7%. I see the Alpha on your recipe used 4.8%. I am uncertain if I will be able to get to the LHBS to get the correct one before my planned weekend brew. Can I scale down the amount and still be ok, or could the NZ variety cause a undesired change in my beer?
Also, it is in a foil vaccum wrap, but appears to be leaves instead of pellets.
This is not an issue on both counts ( not sure how you got New Zealand Hallertau though, it's one of the most common hops from one of the more obscure growing regions).
Variety trumps growing region in what makes hops taste different. You can multiply the AA number with the weight in ounces. Then divide that number by the AA of the hops you have and that should tell you how many Ounces of the hops to add.
Additionally, whole hops will bitter, weight for weight, with pellets -there is no conversion ( the exception being fresh, not dried, hops where it's about 7 to 1 due to water weight).
Also, the earlier in the boil, the less the variety matters. Up to about the 30 min mark you really are getting bittering from the AA and not character like flavor or aroma with most hop varieties (there are some exceptions to this from what I understand).