Something to help those zodiac Zeta farming:

Light Values:
•Feeble: 50 (Confirmed)
•Faint: 100 (Confirmed)
•Gentle: 200 (Confirmed)
•Steady: 400 (Confirmed)
•Forceful: 600 (Confirmed)
•Nigh Sings: 800 (Confirmed)

As with Novus, you need a total of 2000 in order to fully awaken each Mahatma. This can be seen from using the Zodiac Glass but you will also be notified when ascension is complete in the chat log.
For those who don't remember the Novus stages, they are:

•'No Sense': 0 - 199
•'Indisctinct Sense': 200-399
•'Faint Sense': 400-599
•'Slight Sense': 600-799
•'Modest Sense': 800-999
•'Distinct Sense': 1000-1199
•'Robust Sense': 1200-1399
•'Vigorous Sense': 1400-1599
•'Intense Sense': 1600-1799
•'Extreme Sense': 1800-1999
•'Bursting Sense': 2000+ (Complete)

For current Dungeon light bonuses:
http://www.reddit.com/live/ugvcoyhc6yma/

taken from: http://www.reddit.com/r/ffxiv/comments/2x17mi/zodiac_zeta_upgrade_information/