first grow 4 autos HPS 150w

Hi @Diegodelmar! Indeed, FastBud's strains are not supposed to be so slow. I don't think your day temperature is an issue, as 28°C seems fine and I grew many FB's strains under this temp, but your nights are a bit cold and the difference is huge (-11°C), such temperature fluctuations can lead to bad photosynthesis. I suppose they're looking really sad in the morning when your light turns on? If so, issue is confirmed, night temperature should be fixed. Now about waterings, your soil looks very wet on the pictures, do you let it dry between each waterings? It needs to be on a dry/wet cycle, in order for the roots not to suffocate/get drawn and to keep on spreading, searching for water. As you guessed, those two issues are slowing down your plant's growth and will potentially impact your final yield if nothing is done asap. As an emergency move, I would let the soil dry for a few days (feed with foliar spray if needed), and do everything to raise up the night temperature by 4-5 degrees. One way would be to put your plant on a 24/24 schedule, with the light always ON. FB's strains are known to work pretty well in a 24/24 schedule. Another way would be to turn the the light on after the sunset, but this might reverse the issue (with too-hot nights for your plants). Hope this helps, I'll be around, keep us up-to-date and happy growing! 👊

I'm thinking about buying a 3+2 pack of this strain to grow outdoor... so curious about this, following :)

Good luck! Please accept this gentle lesson in photography. Out of focus, blurple light pics are of little use to viewers. Your phone will take sharp pics but you must: 1- hold it steady. Brace it against a tent pole maybe. Don’t digitally zoom in much - you can always crop the shot later. 2- add at least 1 plain white light bulb and turn off the grow light to take pics 3- turn your phone sideways! The lens was designed for that format and horizontal pictures are ALWAYS better than taken vertically. Think of your TV - is it vertical or horizontal? For better pics and especially video, turn your phone sideways Again, good luck