Thanks, all! I will incorporate a yet newer version from Nev and eyeball it. It sounds like that’ll ensure a consistent environment for the first part of the scene, being nighttime until the establishing shot after Luke catches the saber. It’ll be just a little brighter for that part of the sequence, again in order to ease the burden of the feather mask around Luke.
I think with this context it is now unmistakable that Rey arrives at night and the dawn arrives during her time there. This ties in well thematically, obscures the less-than-stellar soundstage set for Ach-To, and gives a visceral sense of the passage of time even if the sequence is still characteristically rushed.