My (and Reva's, by extension) intention is to keep lights out, except maybe for a personal flashlight or two for navigating tricky terrain. You mentioned it was a DC 12 check to navigate in darkness; Reva should automatically pass with +12 Piloting. After they'd made it a bit out from the landing site, she'd tell Jules to turn on his light, keep fairly low to the ground, and scan the terrain for unusual features (any signs of sentient activity foremost). If something's amiss, he'd be the party's "advance warning" (and decoy against an ambush, if it comes to that). If Reva gets an alert ping from Jules (Perception +10), she'll stop the buggy & use the live optical feed to her rig to see what's the matter.