How do you farm Light for Anima quest?

[Kalise]

Do you need to have the weapons equipped while doing the dungeons? Or can you just equip them before leaving?

Just have them equipped for the final boss.

If you want to be really cheeky, you can quickly equip it after you kill the boss, but before the death has registered, but honestly, you shouldn't have much issue with just killing the boss with the Anima weapon.

Also how do you know a dungeon has a bonus?

Basically, after completing the dungeon instead of getting a message to the effect of "Your weapon emits a gentle light" you instead get the message "Your weapon grows more robust"

Essentially, just look for the word "Robust" in the message instead of "Gentle"

Be aware that the bonus lasts for 1 hour then it swaps to a different set of dungeons (Which means spamming a bunch of them to find the new bonus one...). It's worth chasing the bonuses though, since it literally doubles the rate at which you gain light (Gentle is like +16 light while Robust is +32) and so even if the bonus dungeon isn't as quick as the fastest dungeon, so long as it isn't more than twice as long it's still a gain in light for time spent.

Also note, these rules apply to the Zodiac weapon light farms too if you ever find yourself doing that. Both for the Nexus stage as well as for the final Zeta stage.