I'll leave this thread here. It's got a lot of discussion on the topic.
http://ffxiv-roleplayers.com/showthread.php?tid=8388
TLDR version:
There are a lot of grey areas and things that people will prolly not 100% agree on.
There are also two different "Warrior of Light" definitions:
1) 1.0 players that completed the main scenerio + fought in cartenau (forgotten)
2) 2.0 players that completed the main scenerio
http://ffxiv-roleplayers.com/showthread.php?tid=8388
TLDR version:
There are a lot of grey areas and things that people will prolly not 100% agree on.
There are also two different "Warrior of Light" definitions:
1) 1.0 players that completed the main scenerio + fought in cartenau (forgotten)
2) 2.0 players that completed the main scenerio