I've found that in order to use Lightroom or Camera Raw, I must first convert my fffs to DNGs. However, during the conversion from either Phocus or Lightroom, there is a definite shift in exposure (the DNG gets much darker) and worse, there's a color shift toward red. So I've skipped the whole process and use Phocus or FC to convert directly into TIFFs. However, this deprives me of the control offered by Lightroom and Camera Raw.