I've cultivated autos of several strains under floros, cfl, T5, hps ....24/0..20/0....12/12 and also outside. I feel they benefit from more energy regardless of type......The nicer ones will come from good cultivation, correct feeding/watering and environment....I've had some nice ones from all types of lighting ...with all conditions being equal, my 1000w hps made monsters..........I seldom do 12/12 for autos as their lifespan is set already and reducing energy they need isn't gonna help much...........