A lot of this can also be handled on a case-by-case, use your best judgement kind of thing. We know, OOG, that the light provided by primals is supposed to be strong like a flashlight, we also have a fairly good grasp of what light from a lantern should be like.
Just...don't abuse the system? Doesn't seem like it we need to have a like, specific limit on the number of lumens your torch/lantern can provide without a primal.