When is best to switch lights to 12/12 please as advice I've been given is 18inch height
Also anything else I need to do, dont want it not too work lol
veg for - plus weeks, when the plant is at the height you want flip to 12-12 cycle, when the plants are in veg yes 18 inches is good, when they are in flower lower your light a few inches 14-16 inches, hope this helps
18 to 24 is where I switch but I have plenty of height space. Your girls will double or more in size after their stretch so it depends, how much room do you have?. Another thing to consider is from seed, photos take 4 to 5 weeks before their mature enough to flower. Cheers