i put most of my clones under flor. lites before putting them outside....you will want to wait until they are strong enuf to handle the weather, and will help by taking "smoke and coke " advice by transferring them outdoor and indoor a little bit each day and longer each day..let them build up a tolerance for outside then away you go....
i also have a sun room where i can open windows for ventalition and to get them youst to the wind,,and i dont use lites on them out there and they do just fine in both cases.,,BUT the plants i have put under the lites seem to grow a bit faster..and i had my lites on 18-6..