Hello and sorry about my english ;)
I played a bit with BumpMapping effects and i noted, that the Y-Axis of the "Light" is wrong... I don't know how i could explain better but when you look closely to the effect, you can see, that the reflection of the light is opposite where it have to been normally...
I've make a quick "demo" so i hope you see what i want to explain ;)
(and also in the "Rain Demo" of the "Ghost Shooter" is it so)
DEMO BUMP MAPPING