to much light?

Hey there at this stage I will keep the par around 70 to 100. After plant stops having vertical growth after the point it’s at now. I like to dial down the light to 70 to 100 to 120 depending on how the strain responds to it. What you’re looking for it’s about 1cm spa ring to start happening between the nodes of the plant. Right now the light intensity is to high and is starting to make the plant grow all on top of itself and not have any vertical spacing between nodes. I know online everyone says todo high but that just stunts growth with seedling stage less is more. After your 2 sets of leaves get a little larger within 2 or 3 days you should be good to transplant to a new pot. I would make sure to let that pot get dry b4 transplanting. I like to have the solo cup soil dry and then put it in a larger pot if of soil and that soil I will pre wet b4 I put the seedling g in it. That way your not too watering the soil right away and compacted all the soil and over watering you can make the soil just damp enough The humidity is in a good range I try and keep it above 60 below 70 to 75 with a seedling and 25c is perfect temps Also sometimes with a seedling I think it’s better to have the light further from the plant but the intensity higher compared to the light being closer with less intensity. With an led that runs you are able to get the same amount of par from the light being in high but far from plants compared to lights turned on lower intensity but the fixture being right all up on the plant. I think distance is always better Good luck

Hey growmie, yeah 10cm is way too close, even at 280 PPFD — seedlings don’t need that much intensity, especially not that close. They’re more sensitive to radiant heat and light proximity than people think. That yellowing could be light stress or early root zone issues from overwatering — those cups can stay wet too long. I’d back the light up to at least 30cm, maybe even 40, and make sure the soil gets a proper dryback between waterings. Should bounce back quick if the roots are still healthy.

The spots on the single-bladed or even 3-fingered leaf is nothing to worry about. These intitial sets of leaves often have blemishes that are not representative of the future growth. if you lowered light without adjusting power, most likely it is too much light. The resulting spacing between growth nodes is your guide.. make sure it develops but does not get lanky, either. you could raise back up to the distance you are familiar with, take a measurement, then reduce the distance and dim light until you hit those same numbers.. simple as that. klux or umol/s measured is how much light it is getting. Future reference - a single location measurement is just umol/s of PAR or PPE/PPF, it's not PPFD. You take enough of those over the footprint of garden from saem distance and average it out for a PPFD estimate. you can reference that with hours of operation and get DLI. can google for DLI tables. easier to give a target for a mature plant. So, you have to start a little lower, and react quickly amping up light when it stretches. you'll top off at 35-40DLI at best. and that takes a fairly well controlled climate. 25c and 70-80% - RH is too high. Again a VPD table can help fine-tune here. Early vege you probably want no higher than 1 VPD, but anything over 65% RH you don't want long-term as that invites pathogens. Short-term is fine... cuttings survive high RH / low vpd, obviously. If taking atmosphere measurement, the VPD will be inaccurately high. Subtrace 3F from air temp for use on VPD table, so a little less than -2C. Like dli, these are ballpark figures. Always observe and react to plant from there.