Favorable lighting could make for some fun moments in role-playing. Also, from a flavor perspective this class is pretty crazy-awesome: Armored Radiance. 'Nuff said. Final note: Stupid Beam has to be one of the funnier ability names I've seen in a while
Anyhow, time to nitpick:
Opportunity attacks are provoked, not provided.
At the beginning of an ability description you should mention the level at which it is gained.