First of all: Hi to everyone! Just registered.
I’m a beginner grower, finishing my first grow.
My setup: homemade indoor grow tent with 150w CFL and 2 computer fans for air circulation (in/out).
My situation is as follows: A friend of mine, wanted to start growing but after his seeds sprouted had some problems and couldn’t continue to do so, so he asked me if i wanted his seedlings (about a week old). Since it is difficult to get quality seeds here, i accepted the seedlings. They were growing outside (so something close to 13/11h light cycle), when i took them in we started having some really bad weather and i put them in my grow room, which is on a 12/12h flowering cycle. I’m harvesting later today. The seedlings are now maybe a week and half old and about 7-8 cm high.
My question: after harvesting my adult plants, is it possible to change the light cycle to 18/6 for the seedlings? And if so, how would i do it, gradually or overnight?
Thanks in advance! I can post pictures if requested.