Model of led? How far away is ur led ? If u got a iPhone it’s easy to test ur general intensity and know if it’s very high in ppfd, I suggest for autos a veg stage/mom ppfd aka 450-700 ppfd aka 40-50% less than flower stage intensity for photo, anything above 950 needs co2 none the less and many pheno’s/strains no matter what def have limits so key is also knowing such and why waste light /power of plant is not liking it. If running multple plants and u noitce such and good sign of it mid flower if the plant u see the top buds are if not smaller than mid range , if u see such move that plant to less light intensity spot like side part of sea of green . Done that many times when a pheno is new and it saved it’s worth cause the plant would degraded and def been boof.after u know what plants like or dislike such u can def have the higher input ears in highest intensity parts or grow the lower intakers under dif light or vice versa and dim em accordly.
since ppfd meters are costly, I suggest run ur led at highest suggested point and dim to 50-75% but ethier way I suggest if u got a iPhone and some other branded work is using ur phone as a light meter. Even if it’s for general ruling of which parts of ur sea of green are obvious way stronger area, closer to plants = stronger in core but further away gonnea be more stable light level . def matters on led model cause some are like strips and are very balanced where some beam the light and u def gotta be careful.
Here’s the free app, I wouldn’t even do the non free version and I use it as a general test, that and using a measure to know it’s obvious in right distances cause many times till I got more ocd and did it when flip-growing I was off and those little things def can make or break ya or stress plants
The grow light meter app to measure PAR / PPFD, DLI, lux / fc, or Kelvin with your iOS or Android phone. Including PPFD meter and DLI conversion for plants.
growlightmeter.com