I recently posted but have another issue, when exactly should i start 18,6 light cycle my plants are around 2 or three weeks and are about 2in tall have 5 sets of leaves excluding the round ones
Then you should already be on some sort of veg cycle...veg is first..then flower which is shorter...or do you mean you starte the plants on 24/0...in which case you can change it whenever you want.
I start on 18/6..and they stay 18/6 til flower where they go 12/12...although to conserve power I have recently gone to 16/8 and 11/13...Lol..gotta pinch those pennies anyway I can.
24/0 for clones, 18/6 after transplant (Keep in mind I run hydro, so I don't transplant multiple times, I use a aerocloner with rapid rooters and transplant into hydroton), 12/12 when desired.