How to tell if this is light burn?

[humanbian]

Or something else? I don’t think I see any pests, but what do you all think?

Running under LEDs for about 15 hours, about 72-75 degrees F, humidity 50-90% depending on how often I mist.

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[Grey Moss]

Does not seem to be burn to me. Badly sunburnt leaves turn red and then dry out, turning wrinkly and brown. That seems to be a patch of dead tissue. It's not an issue now but keep an eye on it to see if it spreads beyond that leaf.

 

[humanbian]

Thanks Grey Moss! I had noticed it initially spread from about half that but it seems to have stabilized. Why does that happen? Is it sometimes symptomatic of a larger issue?


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[humanbian]

Update here. The area seems to have started spreading, and another, new leaf is exhibiting the issue. Interestingly, it's vigorous and producing some of the nicest pitchers in my (relatively new) collection.

Any thoughts?

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