Should not have caused to much damage although things like that can cause the plant stress and cause growth and flowering to slow down. If it was just a few minutes I am sure you are ok, plus it was just the bedroom light, which I imagine is not to bright anyway. If your friend wants to look at plants tell him to grow his own, he obviosuly is not so bright himself, it could have caused you serious problems with your crop dude.
Cheers,
BigDaze