Since I've read different stories about this , here is my version.
I just finished the mannequin quest and I bougt 4 extra ones, put them( all granted of light energy) in storage and I have no others furnishings , means my MH is full of light energy.
Full moon light days comes , so I decided to do my usual Lightening Bows , but this time on my MH(I didn't see any difference crafting in MH outside b4).
Here are the results => 15/24 Lightening Bows +1
I usually get ~5-10 max.
Tried it again on the next moon , got 14/24.
Well I don't know for you , but for me it seems to work :wink: