I believe it's phosphorus, second opinions?

As the title says. I trimmed this little leaf near the bottom of my plant, was the only leaf that looks like this. The other leafs seem to be a wee darker than normal. After doing research I came to the conclusion it's phosphorus, but am skeptical because from what I read, it is usually present where the light is hitting it most.

Sorry about the HPS lighting.


And thoughts would be helpful.
DrJohn

Turn the HPS light off when taking pics or remove the plant from the growroom to take pics.

Do it and repost the new pic.

Should you be correct keep up your night time temps .....?

Yes. That is the good ole' "I'm too cold" phosphorus face on the leaves. Kind of a spooky rounded out shaped eyes and eerie ness huh.