I've finally introduced orks in my game, and the thought occurred to me: Can orks in WH40k see in darkness? According to the Creatures Anathema they do not possess the Dark Sight trait, which is the only darkvision trait in DH rules (unfortunately). In various other Fantasy literature,. they have been known to be able to see in areas of very low light (starlight etc.) or even in total darkness (unlit caves).
So any WH40k enthusiast here that can provide me a fluff answer on it? So far I've presented the orks using torches and other lights during the night and in caves (mostly for the benefit of the Acolytes and the coolness factor), but could they live without light at all?