I have a grow box, with a 400w HPS. Box demisions are 4' h x 4'w x 3' d, i have a inline fan bringing in air from outside, and a exhaust fan near the top. I turned on the lite yesterday and put one of those remote thermoneters in the box, and the temperture got up over 100, the strange thing is the exhaust air was cool coming out of the box, and it didnt feel all that hot when i opened the box. Any help on this would be greatly appreciated, I have plants that need to go into the flower stage, but i dont want to kill them.

make sure youve not got the thermometor under direct light or youll get a false reading

Im thinking that what it is, that lite fills that space very good, where should i put the therm???, i did the hand thing, and about 12 inches down it wasnot hot al all.

how bout puttin it on the ceiling of the box? there shouldn't be any direct light up there and it should be the hottest point in the box.

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my eyes always look like so if you dont like it! NOT GREED PEOPLE!

yeah id try up the top aswell itll b the warmest but yuoll get a proper reading
but it shouldnt be anywhere as warm as if direct light was on it i done the same thing its a big learning process always something else to learn while growing eh let me no how much it drops evven hang it on string at the top above te shade

Yeah, I have problems getting decent readings in my cabinets due to the body of the thermometer heating up and too much direct light.

I've been thinking about buying in infrared spot thermometer to get rid of the guesswork. I'm thinking it might be able to tell me the actual temperature of the surface of a leaf.

Non-Contact Handheld Infrared Thermometer N/A N/A

how much r they maccabee sounds gd

Macabee I think ur dead on, the black plastic remote thermometer is what heated up, other wise the air coming out of my exhaust would have been hot, not cool like it is.

thanks

That one's $25.