[trapae]

This week I am going to brew an easy drinking summer blonde ale that I've brewed before but I want to sub the 2 late cascade additions (20 and 5min) with mosaic (which I've never used before).  Question is, since mosaic alphas are about twice cascades, and I want to keep same IBUs,  Do I:
1.  Cut both mosaic additions to 0.12oz and keep all else the same, or
2.  Keep mosaic additions same as cascades 0.25oz, and decrease the 60min centennial to keep the same IBU?

I hear mosaic is quite strong, but I don't know if 0.12oz x 2 is enough to contribute any significant taste.
Below is the recipe for reference.

Thanks in advance,

Batch Size: 5.85 gal
Boil Size: 8.00 gal
Boil Time: 60 min
Color: 3.6 SRM   
Bitterness: 23.4 IBUs
Est OG: 1.040
Est FG: 1.008
ABV: 4.3%

Ingredients
Amount   Name
7 lbs.         Pale Malt (2 Row)
12.00 oz   Cara-Pils/Dextrine
8.00 oz   Caramel/Crystal Malt - 10L
8.00 oz   Vienna Malt
0.30 oz   Centennial [10.0%] - Boil 60 min
0.30 oz   Centennial [10.0%] - Boil 35 min
0.25 oz   Cascade [5.5%] - Boil 20 min
1.10            Whirlfloc Tablet (Boil 15 min)
0.25 oz   Cascade [5.5%] - Boil 5 min
2 pkgs   California Ale (White Labs #WLP001)

[Stevie]

Use the same amount and adjust your bittering addition to compensate for the higher alpha late hops. I don't adjust anything less than 30 min

[HoosierBrew]

Use the same amount and adjust your bittering addition to compensate for the higher alpha late hops. I don't adjust anything less than 30 min

I agree.

[santoch]

I agree too, with the minor difference that I use 20mins as my cutoff point instead of 30 out of personal preference.

[fmader]

Open mosaic and dump them in the trash 

However, if I did love mosaic, I would treat it like mentioned above. Cut the bittering. Looks like a nice mid summer drinker. Enjoy!

PS... I'm just busting your chops on the mosaic. Obviously people love them. I just don't.

[trapae]

Will do, thanks

[PAYCHECK]

This week I am going to brew an easy drinking summer blonde ale that I've brewed before but I want to sub the 2 late cascade additions (20 and 5min) with mosaic (which I've never used before).  Question is, since mosaic alphas are about twice cascades, and I want to keep same IBUs,  Do I:
1.  Cut both mosaic additions to 0.12oz and keep all else the same, or
2.  Keep mosaic additions same as cascades 0.25oz, and decrease the 60min centennial to keep the same IBU?

I hear mosaic is quite strong, but I don't know if 0.12oz x 2 is enough to contribute any significant taste.
Below is the recipe for reference.

Thanks in advance,

Batch Size: 5.85 gal
Boil Size: 8.00 gal
Boil Time: 60 min
Color: 3.6 SRM   
Bitterness: 23.4 IBUs
Est OG: 1.040
Est FG: 1.008
ABV: 4.3%

Ingredients
Amount   Name
7 lbs.         Pale Malt (2 Row)
12.00 oz   Cara-Pils/Dextrine
8.00 oz   Caramel/Crystal Malt - 10L
8.00 oz   Vienna Malt
0.30 oz   Centennial [10.0%] - Boil 60 min
0.30 oz   Centennial [10.0%] - Boil 35 min
0.25 oz   Cascade [5.5%] - Boil 20 min
1.10            Whirlfloc Tablet (Boil 15 min)
0.25 oz   Cascade [5.5%] - Boil 5 min
2 pkgs   California Ale (White Labs #WLP001)

I have done this by putting splitting the addition and reducing the time in the boil by half, then the l;ate addition doing at flame out while whirlpooling.  Seemed to work pretty good for me.