i have the same light and i'm a HUGE auto lover!! i use the mh bulb on 18/6 till they show sex, round 17-21 days, then switch to hps on 20/4 for the rest of the grow...my plants seem to love this and i get big yields for auto standards...my first time trying diesel ryder i had 2 plants that were over 2 ozs a piece....good luck
no problem at all man, good luck on the grow..auto's are awesome for newbies, their super forgiving and easy to grow...just go really light on the nutes and you'll be fine..
yeah, just work your way up on the nutes, i never got to full strength...now i barely use nutes cause i'm an organic soil grower and my soil is loaded with goodness...i just feed some organic bloom a couple times during flowering, as well as molasses throughout...before sexing you can feed them a very light dosage of some grow nutes....