Light burn or not?

Is it light burn?
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    Hi all, my 1st grow forced into it with the lockdown, shuda started decades ago.:rolleyes1: I'm growing indoors in soil, tent 80 x 80 x 180cm. 600w HPS dimmed to 400w. Lights 22"-28" above the canopy. It seems 1 plant only is getting light burn or maybe not. Edges of fan leaves gone brown from the top. Other plants are fine. Any ideas? Cheers
     

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