How should i switch over to hps

its my 1st grow and im going on a rather large scale (60 plants) figured why not go big. using a 60 plant dwc system i built and im currentl vegging im going to cut them to flower soon but dont know the best way to do so. im currently on 18/6 from 4am-10pm but i want my 12/12 to but like from 8am to 8 pm. when im about to switch it over should i just let them sleep 4 extra hours? and how far should i keep my light from the plants. its a a 1000watter

I'm no help but was wondering the same thing. Good luck on your grow.

You got it right,pick the best 12 hour period where the lights are on so you have the most time with them,letting them sleep a few extra hours isnt going to hurt anything.

cool thanks what i thought. thanks for the help