New grower here having some trouble on week 4 now ...

for example lower power lamp (25-30%) your specrum have much more blue thats need for seedling 250-400ppm the specrum is great "right distance" and you incresed the power and you gained more RED's led lamp mehanic this power = blue light up to red if you incresed power, for example 50% power thats is maybe mid summer you have blue and red egal thats is the vegetativ shape but you need right distance.. i hope so i can help for you

your lamp distance and power ? find you PPEDe for lamp and calculate your ppfd for pre flower you need 60-70% power above 650-700 ppfd need the full power for lamp you gained much spectrum not need this time you use max power the lamp, your plant cant do more height have small and bigle leaf right spectrum use you can incresed height my tip for you back up lamp power 65% and find applicate for phone quantum sensor app try on understand you make for plant all things humanity temp light soil feltelizer so you modeling life circle start lower level light to up hight so first day of spring and to go end of summer "this is the way" for model for crop 25% power 30-40-50.... etc so much ppl no understand oh yes have big leaf and so cute that is worng you no lettuce traing.... and best way learn learn learn find Bruce Bugbee videos gl hf

It has already switched to flower. You don't need to change the light cycle for an auto to flower. Keep the lights on/off at 18/6 or 20/4. It doesn't look that big so it probably didn't have the best start.

Nitrogen toxicity, stop feeding or reduce it heavily.

she already start flowering