Light Burn?

[mirion]

I am not sure what is causing a slight yellowing of the leaves on my seed started plants. I acquired some high end lights this year from an auction and I am thinking maybe they are a little too intense. The attached photos show the part numbers, specs and a plant that is yellowing. The lights are 24 inches above the plants. What do you people think of this issue?.....Thanks, Mike

[Rwise]

I dont think that is a burn, need more details.

[DW2]

Yup! The Devil is in the details!

[golfnrl]

Give some grow details. Watering, feeding schedules, grow medium, climate conditions in your grow space, etc. I don't see perlite or other drainage material. What are you feeding your plants?

[mirion]

Seeds were planted 4 weeks ago (April 9th). They are watered and misted once daily. Just started adding Bontanicare Pure Blend Pro to the water at 18ml/gallon. Media is a Burpee Coconut Coir mix. Plants are in a homemade tent made from a white plastic tarp. They are sitting on a propagation mat that brings the soil temp to approximately 64F. When the lights are on the air temp is around 72F and the humidity in the tent is 42%. The seeds are purchased Humboldt seeds. I also planted some scavenged seeds that were found in last years plant and three of those "damped off" and died (hoping that is the correct term) so I thought maybe I was overwatering. The plants are in peat pots that are probably wicking away some of the moisture so I am planning on moving them into plastic pots soon. I am in mid-Michigan so moving outdoors will not occur until late May. Thanks for the response.....Mike

[User420111]

I don't think it's light burn. Those little single leaf nodes in the beginning, they aren't much better than cotyledons. Sacrificial leaves for the next set. I'd wait it out

[Rwise]

Could be over watered, could be nute burn, watch the new growth.

[mirion]

I'm pretty sure that the problem was not enough moisture. 36 hours after moving the sprouts from the peat pots into plastic solo cups they are already looking better. The peat pots apparently were wicking away to much moisture. Thanks for the input.

[User420111]

Peat pots got me bad one time! Long, long time ago before growing was legal I had my only seeds up to about two inches high, in a dozen peat pots, and put them outside to catch some sun. Well short story even shorter by the time I checked them they were all mummified. Still stings to remember

[homegrown]

yes those peat pots were your problem..tried it once. They wick too much moisture away, plus they dont break down as easy as they say. Outdoors, sort of but indoors not at all.

[User420111]

I have also found that outdoors, racoons like the peat moss cups. Don't ask me why

[hairyman]

They look dried out and undernourished.

[3Berries]

Yellowing from 'light burn ' is a calcium deficit I've found out. If they get enough Ca and water then the lights too close will cause canoeing but stay green; within reason....