First Grow Ever! 9 White Widow 1000W HPS 4x4 Tent Hempy Buckets

SmerkedOut said:

I'm honestly not sure. The canopy wasn't warm at all from what I could feel, but others have suggested it was heat stress. So I'm not sure if it was just from late flower, or if it was heat stress.

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If it is not from heat stress, it is the leaf transpiring and photosynthesizing at its max capacity, lots of transpiration, healthy vacuum. Not a bad thing, unless your medium gets drier than ambiant air, then your plants get sucked dry and the pours close.