leaf tips turning light green

Driz420

New Member
I have this problem and read that this is light burn. Doesnt seem like it should be, because my light is at 50% and plants are 28" away. I have a FC-6500 light. According to chart the plants are getting around 500-700 ppfd. Any thoughts? The two plants that show this are autos.
 

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Looks like tips got nutrient burn. Mine get like this in mid flower when im juicing them with PK. I usually just water without ferts next time and rotate feedings
 
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