autoflower vrs sog amount of time + light ?

light question first, i need a hps light, have a mh already
my question is , is a switchable ballast from mh to hps worth buying? does it do both jobs as good as a seperate unit
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i want to grow autoflower plants, i love the 10 wks to bud, i do not want large quantity of bud, just 1-2 oz a month.

if i tried sog, how long from spouting to plucking and drying?
i understand it might mess with potency, but i am not intyerested in getting knocked on my ass, just a smile on my face

I would go wit hthe new HPS/MH 1000w bulb. Best of both worlds.
Soory I don't do SOG. I grow mine as big as possible, get up to 10 oz. per plant.