Stupid question, especially based on your most recent posts, but have you tried reversing the wiring between the rectifier and the light? LEDs only work for one direction of current.
Yes, I know it is a stupid question, but ya gotta start somewhere.
__________________
I stop for people / whose right of way I honor / but not for no one.
Originally Posted by
bragi 
"However, it's never a good idea to overgeneralize."