Light burn or deficiency?

I’ve noticed on my scrog there’s an area that appears lighter green then the rest. I’m guessing light burn but it seems to effect the right plant more then the left, so maybe a deficiency as well? Some of the light leaves are on same branches that are darker further out.

I have a 600w hps in a 4x4 about 14” from the canopy. Temps arrange from 72-77. Almost three weeks into flower.

I’m feeding GH 3 part nutes weekly but watering every 2-3 days. Ph of 5.8. Growing in promix hp in fabric pots, ie soilless

I’ve bumped the light up a few inches for now

Any suggestions?

canopy through blue glasses


Leave samples. One from light area one from the outside:

Add 1 tablespoon of epsom salt to a gal should clear it up

Of water

globalinc said:

Add 1 tablespoon of epsom salt to a gal should clear it up

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Hi there, what is the purpose of the salt here?