Ganja Dwarf question

I am buying some Ganja Dwarf lowryder seeds from AMS and it says its autoflowering so how do I do the lights?
18/6 or 12/12

just leave those suckers on

if you really want to you can 18/6 it

20/4 is recommended, however they will flower no matter how long you have the light on. BTW lowryder original isnt that good. Hope you got #2