Yeah me too, because i dont have a lot of room so i will be flowering my plant at about the same height as yours. Im sure it will be enough light, but i wouldnt expect anything crazy.
If its a dixie cup.. i would water it every other day... just a little bit of water, seedlings dont need much water. You will need to transplant in about a week and a half. Since its a dixie cup it should be very easy to transplant.