<span class="link_user">@SheeshtheSchaller</span>, Appreciate the info :pray:
Yeah PPFD ranges seem to be all over the place depending on source and cultivar. I’ve seen general seedling recommendations closer to ~100–150 PPFD, but I’ve also seen some strains (Amnesia included) tolerate ~200 if everything else is dialed in.
From the pics it looks like there may be more going on than just light though, possibly early root stress, watering, or temp/RH being a bit off. Seedlings can stall even when PPFD is “technically” in range if one of those factors is limiting.
Either way, sounds like you’re keeping an eye on it, which is what matters most early on.
One other thing I noticed — the light distance looks pretty close. Around ~11–12 inches can be a bit intense for seedlings even if PPFD readings don’t look crazy on paper, especially with LEDs.
For seedlings I usually see better early growth keeping lights closer to 18–24 inches, then slowly lowering as they establish and start pushing new nodes. Once they’re solid in veg, tightening that gap makes a lot more sense.
Sometimes backing the light off a bit early helps the plant focus on root and leaf development instead of just managing light stress.
