The cobs dont generate heat. I had almost 6 months of unhappy plants from cobs putting out too much light, no cupping ever. Yes, i got bleaching too, deformed pistils, etc. Lights to close and too intense. Hard to believe too much light can be bad!
 
View attachment 805750 B- close up of the yellowing
The plant looks healthy a bit of bleaching from the light being to close raise it. Just let her grow and if she stays squat defoliate and get bud sites showing
Here is one of my Squatter plants done like a chicken dinner Genetics play a huge role on whether they stretch or stay squat different phenotypes can play into size too. You also have to have your light hanging at the correct height. As Dudeski said that could be an anomaly I have had chlorophyll anomalies before one side of the leaf totally green the other side no chlorophyll.
IMG_5956.JPG
 
Quick update: I did raise the light higher and yesterday adjusted the ph (raised to 5.9) Plants "A , B, C and D" are coming right along. So far the yellowing on "B" has not spread to any other leaves, but keeping an eye on it.

Thanks everyone for the feedback and help.
 
Ok. I guess we can safely say that it was just an anomaly. So, it is day 25 for her? I think in weeks time typically you should start to see some early bud formation / pistils.
 
Day 25 Pic Update: The girls are looking great "A and B" is growing fast, "C and D" are about to hit their first rapid growth (if they are like the other two, around this time A and B grew very rapid)
 
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