Sorry but I am not sure of the question.

If I interpret correctly....you vegged for two or three weeks with only a 15W flo light?

If I interpreted properly, then yes, your plants suffered greatly and will not be as they should have been.

But please this cant be right...because then that means you would have vegged with a total of 30W floro?????????

Forgive me but it is still early and I have not yet gotten stoned