Your light spells are remarkably potent, breaking through holy resistance more readily than normal.
Prerequisite: Light Penetration.
Light spells you cast are harder to resist. Any holy resistance on a creature is considered 2 less when determining damage from a light spell, but is considered 2 more with dark spells. This bonus and penalty stacks with the one from Light Penetration.
Special: You can gain this feat only once and this stacks with the Spell Penetration feat.