If it's just the one leaf then I wouldn't spend too much time thinking on it
It's Not What You Know, It's What You Can Prove
That's good to hear. It's more than one leaf, but overall the plant looks healthy. This is just another reference pic for my personal grow library.
As shreder suggests, it is most likely temps... but, with your light, look at something to blow between the light & canopy... then drop the light back down again
If you get stuck with your lighting, feel free to drop me a PM, I have a lot of experience with 150w HPS
Yep...problem solved.
I have a 4 inch, 13 watt fan now blowing between the light and canopy.
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