Just had a thought I figured I'd run by all the experts here.

When do you know the growroom is too hot?

Is it when the ambient room temperature gets above 75-77 , or when the measured temperature directly below the lamps in the growing canopy gets above 75-77?

thanks in advance!

you want the ambient temperature to be around 75-85 degrees. The plants can stand a much higher radiant temperature (direct heat from the lamp). I would say put it in the shade near your plants.

I measure temperature everywhere in my rooms...
right at the top of the canopy. outside of the canopy. oppsite wall...
i really really want to make sure the temp & rh are straight...best thing you can do for your plants is make them comfortable.

__________________

I choose to live and to Lie, kill and give and to Die,
learn and love and to Do what it takes to step through.

thanks for the replies guys. I guess I have another question to clarify then.
so when which thermometer gets over 75-77 do you start to worry?
cause when i hang the thermometer in the growing canopy my temps are consistently above 90, but the plants look good and the last few crops have turned out nice, but its getting warmer here everyday. When I put the thermometer near the ceiling, the measured temperature is about 78.

So is this room in need of more ventilation?

i have the same question cause everywhere in my growroom is like 75 or lower except directly under my lights it is hotter, and im using exhaust fan and boxfans in a 8x6x8 growroom

i was wandering the same.where do i really place it?under my lamp is something like 90.next to is something like 83-85.is that good?so any experienced growers know where to put that thermometer exactly?

i hang mine on a wire between my lights so it hangs right were the tops of the plants are

and i dont let it get over 90 EVER, i prefer 85.

but then again i use an A/C set to 72f to keep the room nice and cool

bump

any one have anything to add here ?

if you only have 1 thermometer i would say the most important place to get a reading is near the plants, since you setup everything to be just right. if the temperature around the plants is within the range of what you want then the other temperatures dont matter as much. (if plant temperature is ok then that prob also means the temperatures around the room are ok as well)

measure ur temps at the top of ur plants so have ur theromometers hanging at the same level as the tips of ur plants, u would also want to have fans circultaing the air between the bulb and the tip of ur plants.... 79-82 is said to be the premier temp to grow oin when not using co2