First grow - Girl Scout Cookies auto

there are differenecs, but it's always relative to genetics.. there's no spectrum you can give a naturally lanky difficult to branch out plant into a small bush... in fact it'll still be a lanky sativa-like structure even if you give the "best" light for increased axillary growth. So, worry less about that and more about DLI. you want to be giving upwards of 40DLI to your plants - wither 12 hours or 18 hours - or - over 1m^2 or 3m^2. The amount of umol/s of light you provide is far greater concern than your spectrum at this point, especially given most grow lights fall in a small CCT range and similar SFDs. the amount you give per day is proportional to hours of use. Since you have an autoflower you don't have to worry about that. Also, since you don't have to drop to 12/12 light cycle, you don't need to find 50% more light than what you were able to give before (assumes same area of coverage), which means you can cover 50% more area with your light over 18hours vs 12, but you also run it 50% longer. it doesn't save watts.. just can provide a bit less per hour over the course of a day.

They do look to wet/overwatered If you want to grow in peat it needs to be mixed with 30% perlite to allow for proper aeration and drainage. With out it its to dam wet and roots can rot easily. plus peat is more acidic long term so keep an eye on PH levels and make notes on how to adjust your PH going into the medium. You could transplant into soil or into peat and perlite and be fine. I would also look into feeding it a veg formula vs a bloom formula. Autos don't like feeding strength to be to strong so its best to monitor the EC and PH of the solution. keeping the suggested feeding ratios if its a multi part feed like grow bloom micro but altering the concentrations so its lesser than, just add water till you hit your desired levels. Good Luck!