New Grower New to hydro

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Hi growers,
new to growing but really getting into. Half way through my first soil grow, but hearing great things about Hydro and Autos.
understand that Hydro is difficult but would like a bit of advise,
1, looking at a 2.4m tent with 6 plants and 1200 watts of light. Don't know wether to go HPS or LED. If LED which size lights will I need
2, looking at Forums and people are talking about 24/0. In soil I did 18/6 then 12/12 for flowering (non auto) will it be different for Auto plants?
3,I will be going hydro this time. Single pot bubble buckets. I will be getting 2 pots per plant and refreshing the water daily, will this help control the ph and nutrient levels
4, I have read the forums and there is a term I don't understand, ppm, what is this and how do I measure it

Thanks for anyone's response and help it is all greatly appreciated.
 
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