I never found a light method that was consistent and tolerable. Had intended to complete a third weapon before the patch but I quit because having an unlucky streak with little to no light gains feels like a waste of time and a bit sad. Wildly different results between people using the same methods also seems unfair.

I think even if luck is on your side, there is a point when fighting hundreds of enemy chains is no longer tolerable and it would be better if the light given by Fate NMs was increased so people can finish in a more relaxed way.

I preferred light in zodiac/anima with no RNG; you always receive light if you participate in content and it's the same amount for all players. The only 100% light we get in Pagos is from NM but it's too small amount (or mutation enemies, but getting a mutation to occur is not 100%).

I haven't discovered any light-boosting secrets to share but I think fighting morbols is not so bad relative to other methods and it has the bonus of spawning Cassie NM eventually if people are committed to it.