The (maybe only) benefit: Not the green vision, just plain "night vision". ^^
(At first I thought: "Wtf? Why is my screen green? Bug? Fast, screenshot!", then: "Night vision...

A clock. Usable as modul for the armor can the clock show the time in the gui (could need no / negligible energy amount). (Maybe like in minecraft: the clock shows not the real time, but how long it will still be night / when it will be night.)