In order to be able to set up another tank in my room, I have agreed to adjust my lighting schedule (power bill). I will use natural light (sun light, light from room) until 4:00 pm, then I will switch on the light until 10:00-10:30 pm. I use to switch them on at anywhere from 8:00 - 11:00 am, and turn them off at 10:00 - 10:30 pm.
Both of my tanks right now get a fair amount of light from the windows in my room and hallway. The tank in my hallway is planted, and is lit up by sunlight during the day (I use to drape a towel over the end of the tank to avoid this), so the plants growth will not be hindered.