Plants not growing enough

Thanks everyone. This grow is a mix between natural light (about 8h) and a SANSI PAR30 24W growlight bulb (https://www.sansiled.com/collections/led-grow-lights/products/par30-24w-led-grow-light-bulb). you are all right: it is cold at night but also in the morning during last weekend and it has been cloudy lately. Regarding watering, I am just providing nutrients (RQS Easy grow Tablets) twice/week but because it was not that hot, I understand that I was overwatering. I will leave them without watering for a bit now. The lamp is about 1m from the plants, shall I put it lower? the thing is that most of the light for me is coming from the sun so maybe I will just have a longer wait, hopefully with a good yield. Thanks a lot for the tips

There are several reasons for you (which I have also experienced): 1. It's too cold. At least 15 degrees in the dark, 20 degrees plus x during the day 2. Lighting time for short. Increase to at least 18 hours, 20 hours is better (some swear by 24-0, but the electricity costs are too high there) 3. Hang the lamp a little lower, or you are using the wrong lamp (I can't tell from the diary) But the good thing is, your plant will also flower later, so you don't have any disadvantage (apart from needing more time).

If your Data is correct than raise the light from 15 to at least 20hr. The Temperatures are very low especially at night. And i think you water them too much. They are drowning If you like you can give them a week full of light and no watering and see how they develop :) And try to rise the temperatures as well

Could be the lights not good enough I have had same problems and had to change my lights