First experimental grow (indoor)

Running 3 x 100W custom Led lights. The big plant on left is 6 weeks older than the rest (friend gave it to me which were grown outdoors, she has to wait for others to catch up) The plants are small for week 4 but I know I don't have the best equipment so decided to keep looking for better lights with a stronger PAR value. My current lights didn't come with par values of any kind, was very affordable and managed to get last stock. The plants in potting soil are extremely small and grow slowly, with my pH soil meter it measured 6.5 to 6.8 so I decided to use only rain water since signs of overfeeding showed. Weather are up and down, very unstable here. I also had to deal with mildew in week 2 and 3 with transplant shock (made a lot of errors but lessons learned) Considering to put the 3 small plants in potting soil outside and only indoors at night. Did no training or topping of any kind