Cpt Kirks is right. If you want the noble spiciness of Hallertau then add them in the last 15min or dry hop with them. If they're leaf, maybe dry them out and brew up a lambic.
Per BeermSmith, 1 oz of 1.5% AA hops added to a wort with an estimated post boil OG of 1.040 yields 5.3 IBU, 3 oz to 16 IBU.
Originally Posted by the_bird
Well, if you *love* it.... again, note that my A.S.S. has five pounds.