Nexus Light Grinding in 3.0

[Gunspec]

I really doubt farming primals with light bonus is anywhere near as efficient as it used to be. The only reason to nexus grind right now is for cosmetic purposes, while a tremendous number of new players are running primals either for the first time, or to earn poetic tomes. You're going to end up in a garuda hm that takes too long to enter, and you'll be paired with players who are too weak or inexperienced to do a quick kill. Maybe if your server has lots of people that want cosmetic relics, you can party finder it, but on my server that would be highly unlikely.

If it is something you really want to grind out, it takes 500 fates. Middle La Noscea is one of the best places to fate grind, because the fates are easily soloable by most classes. If you are still leveling to 60, you might want to try equipping your novus while fate grinding in churning mists, since all of those fates count as well. The ilevel 110 weapon isn't the best choice for those fates, but it isn't too unreasonable.

And no, google is not your friend for MANY aspects of FFXIV, since things change considerably over time. Most of the articles about light farm are from a time when lights was 1/4th the current rate, yet everyone was grouping to get it done.

Can't you get light while unsynced?

Nope, the only relic stuff you can do while unsynced are the boss kills in the animus books, and the dungeon completion items for the zodiac weapon stage. You receive no light while unsynced, and it's been stated several times in patch notes.