if you are growing on a window sill they will flower themselves when the days shorten (now) unless you put them on the sill too late. imo if you are going to use artificial lighting schedules there is no point to growing on a sill. if you are doing a true sill grow make sure to keep the window open with the screen down. they like the wind and fresh air and the screen makes it hard to see inside unless you have a light on. southern facing windows are best because they catch the sun when it's the strongest (10am-2pm). they should be rotated on a regular basis. if they are on a sill in a room that you use at night get them the hell out of there. besides the light making your plant obvious to people looking in, the light will fuck up the flowering. i used to grow on sills exclusively before i got the space to use lights. if done correctly you can combine the best of indoor and outdoor growing, sun+environmental control. they don't get as big as outdoor plants, but they can get a lot bigger than typical indoor plants if they get started early enough.