Winnnnnnnn, addendum - I used two low strength nute tabs every two weeks when the nute light came on. My water empty and nutes out lights quit working but I just calculated. I didn't try to use anything else. I had a little damage from nutrient problems, but nothing major.
I think flowering under the AG lights will be a problem - not that they wouldn't, but they will be way too tall - if you cut them back and keep them very, very bush, maybe, but I would not personally expect a great yield this way. If you are going to try this, I would possibly go into bloom pretty darned early. Someone else can say how early is the earliest. I only had one more light notch to go with just over 4 weeks under the lights. I bought the AG in hopes of going the whole show with it, but figured out soon that wasn't going to be enough.
Good luck and let us know how it goes.
