Temperature at plant top

[Crusinjimbo]

I have read loads of temperature posts that for the most part address ambient air temperature in the grow room. I believe the temperature at the plant-top level would be somewhat higher than the "room" temp. Has anyone any information on the temperature is as the level of the leaf?
Thanks, great forum.

[Volker]

I keep my sensor probe about 1" from the grow area top, and try to keep tips in upper 80's, low 90's/high 20's, low 30's. (I"m in a closet with CFL & limited ventilation)

In a grow room, with an oscillating fan, temperature should be pretty much evenly distributed. If there's no fan, why not?

[Garden Knowm]

Hey Crusin.. It can often be hotter at the TOP of the canopy because that is the closet point to your lights...

It is GREAT to have a fan blowing directly between your lights and the foliage(canopy)... at a slight angle upward.. This will help keep the canopy temeratures and room temperatures the same... 75-82 degres is GREAT!

and NOW you KNOWM

[Zandor]

There is an FAQ with pictures on how to properly monitor the temperature at the plants canopy. Try not to go above 85f at the most, 78f is better.