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Where should i measure the temps of my growbox, in the middle, bottom, or near the lamp? im using 250hps with diy cooltube. What temp's can the canopy of my plants tolerate. How near should i let them grow?
75-90 and test near the canopy. buds or leaf closest to a hot bulb will get crisp and show it with bleaching and burns.
ive had canopies that lasted thru -90-92- they did show a little bleaching towards the end and because of the extra air i had to use it wind burns the leaves.
i measure at the bottom of the cab and at the top in the chamber for my ballast.
75-90 ish is a good range. i dont know how hot a cooltube is, but general rule is keep the plants in a range where if the back of your hand towards the bulb is too hot for you to take its too hot for your plants too.