Recommended light intensity for autoflowers fluence spydr 2i 630w led

I’m curious as to how high I should run my led light for autoflowers . I had extremely short , bleached small bud autos this grow - and I believe it’s because I had my lights way to high. My dimmer adjusts from 0-100% and has pulled 2.5 lbs off photoperiod plants in a 4x4 tent.

I’m growing in autopot. Xxl system 9 gallon , with canna coco nutrient line , in 50/50 coco perlite .

I believe I absolutely caused more harm than good , with this light .

I’m open to any suggestions on intensity for seedling stage , veg stage as well as flowering stages early mid late .

These are not small because of genetics - and the 9 gallon pot is 100% full of roots - I think I kept the light to low / to high .

I've only grown photos
Your dli would be way higher if you were using the same light intensities as photos
Seedling low I've the ppfd app it mighten be accurate but when it's 300 I know it's OK
Start of veg end of veg bes different start same as seedling then work your way up a 100 or 200 to out 450 umols by the end of veg maybe even more if you can get away with it 500 maybe

Im gonna get a par meter I believe and do some research onto what autos prefer . I’m not sure if there’s a decent option out there for relatively cheaper than the 250-300 dollar prices I’ve seen ?