Will increasing light intensity restart stalled seedlings

Light is not your problem, so changing that isn't going to solve the problem. Your watering or soil might not be great, and I would look into that before worrying about the light.

My guess too much feed too cold or light to close

It is better not to increase the amount of light while the plant is small; You don’t need a lot of light, but after about 2 weeks from seed, you can already increase the light intensity to about 50 percent of the lamp’s maximum. I say this because I myself use lamps from Mars Hydro

Raising the light intensity will definitely kill the seedlings at this point. I don’t think you have a light issue. It looks like you’re potting them in a heavy soil, which will make it difficult for the roots to start off. Use a lighter soil mix with perlite. Be conservative with watering and nutrients starting off. I would recommend to start over because these will be very slow to recover if ever.

Seeds are looking sickly, one of them is likely going to die. I think you medium is a bit off. I would ave mixed in more perlite for this, soil tends to compact and can make things difficult. Light hanging height should be on their webpage and their recommended settings for seedlings, veg and flower. Just increase it to the next level when its grown out more and has at least 3-5 nodes of leaves. The seedlings looks like something is wrong in the roots. eg burning or rot.

Try reducing it until you see some stretch. If you stall a plant with ight too early, they don't progress to the point of handling more light as they should. In future, allow growth pattern to dictate intensity. Let them start to develop some internode (stem between 2 growth nodes) and then aamp up the light accordingly. Ten inches away is quite close. 25% is more like 50-60% at that distance compared to a more typical 18" hanging distance (50cm?) for a QB style light to get a decent light footprint (don't need a large footprint early on, obviously). Some concern about nutrient content of your substrate too as well as the very likely poor drainage properties. how much perlite? for a soil or sphagnum peat moss that is high water-capacity, you want 50%. For coco, you only need 33%. Do a weighted average and it'll be fine for any mix of the two. mixing in perlite or inert coco will also reduce how 'hot' the substrate is, which is usually a good thing but also means you ahve to supplement fertilizer sooner. Either it's devoid of nutes or the pH is making it difficult to use the nutes etc..

I'd probably start some other seeds if you have them. A new seedling will out pace this seedling. Having a good start is very important. Once a plant loses its vigor it takes forever to come

I would try 50cm on 40% first week, 60% second week, 75%third week. That only applies if the plant is growing healthy tho, so you plant i like a week 2 plant. I would also change the substrate to a lightmix option of any brand. Its the best way to start. Take the biggest pot you have and fill the pot like 90% and water your earth completly, like damping it 36h before you plant. Its good to flush soil before planting and also good for later roots. But for that a better draining substrate like lightmix is needed. Then u put dry soil on top, the place u wanna plant u water before too, and mix it muddy at the place u wanna plant then put your seed not more than 2-3mm deep in the earth. You wont need to water atleast 10days, then if you have atleast 10l of earth you can water 1l at a time and wait for the top soil to become completly dry. Next watering 1,5l, next watering 2l, till you reach the max and your pot leaks 10% of the water. You can in theory water frequently and dont have to wait for dry topsoil, but a overwatered plant is way worse than slightly underwatered. It wont kill your plant atleast.

Get some biobizz light mix soil, that's got perlite in and start over. No point saving them now. Fresh start, also use fabric pots.

One or more of 4 issues are common when a seedling is stalling/stunted. 1. A dense, compact media that hinders root development. 2. Overwatering and drowning your rootzone. 3. Attempting to start a seedling in too hot of a soil mix. 4. Too intense of light.

Hey there I think more your problem is overwtaering possibly Having Temps and humidity pit kf

Start again, don't waste any more time with these, especially if the are autos. Plants that start off like these will never recover fully..........too many issues already.

According to the manufacturer, you’ve had the light right where it was supposed to be. I think the soil mix you’ve got there is pretty heavy when it’s wet. Also seems like you’re just watering mostly the edges of the pot. Your ph of 7 is high as well. I also don’t see where you’ve ever added any nutrition. These things would all be a of concern to me.

Raising light intensity isn’t going to help them. A bit of patience and a light intensity of around 250 PAR/PPFD with a proper environment will maybe save them. 24-25 degrees with 60-65% RH. I’ve seen fuglier plants pull through. I would look into getting the photone app for your phone to measure light intensity. It’s not perfect but at least you’ll be in and around the right ball park. Good luck with you plant.