Once you changed from 16/8 to 12/12 to trigger flowering, this can take 2-3 weeks before anything happens, one week is not long enough and your plant must firstly change her hormones from grow phase to flower phase and this occurs slowly and gradually.
Hang in there, it will happen, but it won't happen overnight.
Do not try giving total darkness, this will just mess with everything your plant is going through.
And yeah, normal pictures in normal light are far, far superior.
Hope this helps,..........
Organoman.