Lowlight, the Rollei isn't really much faster than the Efke.
The issue is the spectral sensitivity of these films. If you look at the curves, the sensitivity drops off very rapidly in the near IR.
To play the IR flash game, you really would want some fresh HIE or... a (sorry, sorry) digital camera with the hot mirror removed:
I have one of these unmentionables and can actually make IR movies of it with a deep IR filter. I do wish HIE were still around....
N.b. it may be possible to boost the IR sensitivity of the Efke or Rollei by treating it with some sensitizer or by hypering it. Ron could advise.