Aye, light source does not interfere how far person with darkvision can see (at least it's not in rules by canon). Besides Adrian's familiar which has darkvision, flight, able turn invisible at-will and is tiny in present form (and looks cute) would be prime candidate to be a forward scout as Adrian can commune emphatically with it.<br/><br/>Also considering familiar is from hell, would it have baatezu subtype as well? Grant fire immunity and telepathy and such?