Sorcerer's Ring  

It seems commonly accepted that this ring along with the other Lv 50 rings kicks in when your Health bar has lowered itself to 75% or less (yellow health). After hearing about 80% mark from many a JP friend, I decided to test some. My recent tests would suggest otherwise. The trigger is indeed in your HP bar, but the cut-off point is not 75%, but rather 80%. Observe:

Gear for the first 3 sets of tests:
-Jupiter's Staff
-Phantom Tathlum
-Demon Helm +1
-Ugg Pendant (Latent active)
-Abyssal Earring
-Moldavite Earring
-Genie Weskit
-Zenith Mitts
-Snow Ring
-Tamas Ring
-Prism Cape
-Penitent's Rope
-Mahatma Slops
-Rostruum Pumps

Test1
HP: Little less than 75% of my total HP bar (511/682)
Day: Windsday
Weather: None
Food Eaten: Melon Pie +1
Moon Phase: N/A 78% Waxing Gibbous
Spell cast: Thunder IV
Mob cast on: Ebony Puddings (Chosen for their low magic defense / resist rate)
Cast1: 1512 dmg
Cast2: 1512 dmg
Cast3: 1512 dmg
Cast4: 1483 dmg (slight resist due to addition of earth weather)
Cast5: 1512 dmg
Cast6: 1483 dmg
Cast7: 1448 dmg (again resist from weather came into play)
Cast8: 1512 dmg (weather dissappeared)
Cast9: 1512 dmg
Cast10: 1512 dmg

Both Ugg Latent and my Sorc Ring latent were in full swing. Next I tried it at my theoretical 80% HP mark.

Test2
HP: 80% of my total HP bar (545/682)
Day: Windsday
Weather: None
Food Eaten: Melon Pie +1
Moon Phase: N/A 78% Waxing Gibbous
Spell cast: Thunder IV
Mob cast on: Ebony Puddings
Cast1: 1512 dmg
Cast2: 1512 dmg
Cast3: 1483 dmg (earth weather came into being)
Cast4: 1483 dmg
Cast5: 1512 dmg
Cast6: 1512 dmg
Cast7: 1448 dmg (again resist from weather came into play)
Cast8: 1388 dmg (weather hit me hard)
Cast9: 1512 dmg (weather gone)
Cast10: 1512 dmg

The latent on the Sorc Ring was still kicking in fully with my ugg latent.

Test3
HP: Just 1 HP over 80% of my total HP bar (546/682)
Day: Windsday
Weather: None
Food Eaten: Melon Pie +1
Moon Phase: N/A 78% Waxing Gibbous
Spell cast: Thunder IV
Mob cast on: Ebony Puddings
Cast1: 1443 dmg
Cast2: 1443 dmg
Cast3: 1387 dmg (food ran out)
Cast4: 1443 dmg
Cast5: 1443 dmg
Cast6: 1443 dmg
Cast7: 1387 dmg (earth weather appears)
Cast8: 1405 dmg
Cast9: 1405 dmg
Cast10: 1443 dmg (weather dissappears)

The latent was not kicking in at 81%. My next three test runs consisted of a specialty day / gear set for ice just to test if it was on a specialty day with bonuses going into the elemental damage.

Gear for the last 3 sets of tests:
-Aquilo's Staff
-Phantom Tathlum
-Demon Helm +1
-Ugg Pendant (Latent active)
-Abyssal Earring
-Moldavite Earring
-Genie Weskit
-Zenith Mitts
-Snow Ring
-Tamas Ring
-Prism Cape
-Hyorin Obi
-Sorcerer's Tonban
-Rostruum Pumps

Test4
HP: Just under 75% of my total HP bar (511/682)
Day: Iceday
Weather: None
Food Eaten: Melon Pie +1
Moon Phase: N/A 80% Waxing Gibbous
Spell cast: Blizzard IV
Mob cast on: Ebony Puddings
Cast1: 1661 dmg
Cast2: 1661 dmg
Cast3: 1604 dmg
Cast4: 1661 dmg
Cast5: 1661 dmg
Cast6: 1563 dmg (I rested a little too much and ugg latent didn't kick)
Cast7: 1661 dmg
Cast8: 1661 dmg
Cast9: 1642 dmg
Cast10: 1661 dmg

Clearly the control of the experiment still works. Both latents are kicking in nicely with the day bonuses.

Test4
HP: 80% of my total HP bar (545/682)
Day: Iceday
Weather: None
Food Eaten: Melon Pie +1
Moon Phase: N/A 80% Waxing Gibbous
Spell cast: Blizzard IV
Mob cast on: Ebony Puddings
Cast1: 1661 dmg
Cast2: 1607 dmg
Cast3: 1661 dmg
Cast4: 1661 dmg
Cast5: 1563 dmg (Again, I rested too much, Ugg didn't kick)
Cast6: 1661 dmg
Cast7: 1661 dmg
Cast8: 1607 dmg
Cast9: 1661 dmg
Cast10: 1661 dmg

Again, both Sorc Ring and Ugg latent were kicking in just fine at 80% rather than the accepted 75% level.

Test6
HP: Just 1 HP over 80% of my total HP bar (546/682)
Day: Iceday
Weather: None
Food Eaten: Melon Pie +1
Moon Phase: N/A 80% Waxing Gibbous
Spell cast: Blizzard IV
Mob cast on: Ebony Puddings
Cast1: 1543 dmg
Cast2: 1543 dmg
Cast3: 1487 dmg
Cast4: 1543 dmg
Cast5: 1543 dmg
Cast6: 1543 dmg
Cast7: 1452 dmg
Cast8: 1543 dmg
Cast9: 1543 dmg
Cast10: 1543 dmg

Just over 80% clearly does not allow the latent of the Sorc Ring to kick in. However .5 of a HP under the 80% mark yielded a 100% kick-in of the Sorcerer's Ring latent very consistently.

Why does this affect me?
Well for starters, those of you making macros so you can macro your HP down to the right amount for this latent to kick in, this can change what equip you were planning on having. 80% of your health bar is NOT yellow. Its still the border of white meaning your WHMs and RDMs won't freak out. They still see white HP. Also in the event you're in an area with undead, you will not be aggroed by them from low HP but can still have super-boosted nukes.