2 of 5 (5 days old) plants are laying down instead of shooting up

@MrGreenMan Thank you for you comment. I'll elaborate on "not worrying about the stretch". At the time of the stretch they were in another room waiting until I was finished with the whole setup of the tent. I'm not worrying about it anymore because I already put them into the tent with the LED lights on 18h a day. So they went from not so much light to the amount that they need. The LEDs I'm using now draw 360W power if that is of any help. The thing is that half of them dropped a day after I've put them inside the tent. That is my main concern right now.

Your seedling should not be 2 inches tall at all. You clearly don’t have enough light or they wouldn’t have fallen over. 4000W “equivalent” is a load of crap. What’s the actual power wall draw? You need to increase the lighting regardless so I don’t know why you aren’t worried about the stretch?

I'm actually not worried about the stretch, I use a 4000W equivalent LED lamp that workes very well, I just shut off one half of it at the beginning. I'm rather worried that 2 seedlings that are around 2in tall just started to lean horizontally instead of shooting up like the others :/

It sounds like they're stretching for the light so bring it as close as poss but careful,If its too hot for your hand then its the same for the plant.They only need afew watts though.Get a smaller lamp.I use 120wCFL for seedlings.They also need the blue light in Veg and people often use the sodium which makes them stretch .Build your medium up around them and make some little stands out of wire to support them if it happens again.Its just happened to several in my friends yard and I did this.

Hard to says without image. But could be that the plant stretch for light du to light being to far casuing the stem to elongate ratter then thickening