Need a Nug to Plug?[read]

I am about to abandon an old method I have been using with DWC, it is probably one of the best around but it is way to time consuming, About 4 hours per day on 15 plants.

My new set up will still be DWC, I am going for only 4 sites.

What does every one here run as far as lights and nutes? What are your schedules / what indicators in the visual growth do you use to determine changing from 18 to 12 or raising ppm and changing nutrient mixes.

note: I am not seeking a how to, simply your own personal approach.
 
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