Growweedeasy.com has some good info. I have grown them with photoperiods and finished them under 12/12 light with no problems. I dont think the DLI is any different for photos and autos, and so far I havnt seen anything to the contrary.  Bill Ward has several videos autoflowers on Utube that are pretty good.  A grower on here recommended topping at about 3 weeks to extend veg a little longer, it works for me and in hydro the end of the stretch is called harvest becasue they never stop growing.

Personally I hate autos, and I admit they are improving. everyone should learn the hardway, Its like peeing on an electic fence, you never forget but every so often you try again just for fun