Hey Lass! I think you’re correct in your judgement that generating light isn’t really an intent that gels with art magic. None of the art magic effects actually express what light does in the Burning Wheels mechanics (which is just keeping obstacle penalties at bay).
Here’s my two cents: while Advantage can help mitigate the obstacle penalties associated with darkness, I noticed that the effect only applies to one ability, while the darkness penalties apply to ALL relevant tests - martial skills, Climbing, Perception and Observation, and much more. So while granting advantage dice to Perception to overcome those obstacles is all well and good, it really doesn’t offer the same comfort as we can expect from actual light. Not without building up an astronomical Sorcery obstacle using the +9 Ob “All Abilities” breadth. Yikes!
And even if that can be accomplished, the spell has not overcome the dark- it’s just literally made you better at everything!
My humble advice is to reframe what the spell looks like. So instead of a +3D advantage to Perception being called “Arcane Light” for example (and encountering the difficulties I’ve mentioned), maybe call your spell “Eye of the Cat” for a more fitting interpretation of the limitations that art magic places on your spell craft.