What % of intensity and heights are you using for various stages of development? I’m sure the product will have (hopefully) have some detailed info.on this…
See if the Photone app works on your phone - it's an app that measures PPFD levels, and it's reasonably accurate according to MIGRO.
From what I've found, decent PPFD ranges are ~150-300 for seedlings, and ~500-1000 for veg and flower.