It's not light burn, you could get much closer with t5s. it's a little hard for me to tell from the picture it's kind of blurry, but if you're concern is a yellowing and maybe slower growth and thinner leaves on top then you have a sulfur deficiency. Some bloom nutrients have extra sulfur, read the label on yours and see if you just need to up your bloom nutrients. Normally a foliar feed of magnesium sulfate or just plain clean Epsom salts would be good. I really don't like to be spraying things on a plant though when it's already in flower. So it would be best to look through your nutrients and consider a different boom booster if you don't have extra sulfur in them already. If you are in soil there may be sulfur in molasses you could look it up and see, I'm not really an organic kind of guy so I can't tell you there.
J
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