Plz help with vegging & light setup PLZ !!!!!!!!!!!!

Hi Guys .. Jst another quick question & any aswers wld b greatly appreciated, a guy told me nt to bother with the 18 hours of light & 6 hours of darkness .. Hes tried to assure me tht i should b able to leave the propogator light on for 24 hours a day without turning it off, its 6 small motavation plants .. 3 weeks old & very well rooted, also wen should i change to a 600?? Toke on Guys

600 what??

what would you say if somebody tells you :"dont go to sleep 24/0"
18/6 period is main for vegetative state.. except they are not AF!

600 watt hps

i move my plants into my hps after around 2 weeks or if the plants have reached around 4 to 6 inch in height with maybe 4 or 5 sets of true leaves.

I always veg under 24/0 light schedule. You will get 30% faster growth when you veg under that schedule. You can veg for 3-4 weeks and then flip them to flower. It really depends on the height too.