[THC] first wort hops

[mr soul]

I am planning an American IPA for later this week.  I was thinking that I w=
ould try out first wort hopping (FWH).  My understanding on FWH is that you=
 put your hops in the kettle once you collect your first runnings from the =
mash and leave them there for the sparge, warm up, and the boil.  Supposed =
to result in good hop flavor.  Anyway..
   =

  My recipe
   =

  2-Row Pale 15.75 #
  Crystal 10L .89#
  Crystal 50L .71#
   =

  FWH Magnum            13AA              2.4 oz
  FWH Cascade            5.6AA             1.2 oz
  Dry Hop Cascade        5.6AA             2.4 oz
   =

  I get 63% efficiency and this will be for a 6-gallon batch.  OG =3D 1.065
   =

  I have been told that in terms of IBUs FWH is the equivelent of a 20 min =
boil.  I am not sure why this is, this is just what I have read online.  IB=
Us come in at 50.6 using this calculation.  For comparison if I use promash=
 set at a 60 min boil my IBUs are a whopping 125!!  Now I like bitter beer =
but come on!
   =

  So my question (finally) is all of the above logic correct.  Those of you=
 that have used FWH what is your experience?
   =

  Tom
   =

   =

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