Whats The Deal Wit These Plants???

Opie.....I'm glad you asked me that question. (:D) Allow me to pontificate. :jointsmile: I use a 1kw hps in a cool tube and do have one of those cool little temps guns and have checked surface leaf temps under different conditions. With a good oscillating fan blowing (room temp approx 85 ish) AT the leaves pretty consistently (between light and leaves....maybe 18 inches of space between them) the leaf temps closest to the light usually will stay at about 78-79. That's for older, mature leaves...new growth can be more tender but I haven't ALWAYS found that to be true. Almost ANYTHING can affect that tho imo.....even if the air cooling the light is 10-15 degrees cooler (perhaps its a rainy day or....) will have an effect. Mylar caused HORRIBLE leaf temp and hot spot issues for me ....especially when I got my cool tube vs my old reflector. Some of the things that will affect the leaf surface temps that I have found are DEFINITELY room temp, how hot and how close is your light, and whether you are actively moving air around the plants among other things. I can't say about humidity one way or the other however....mine's pretty much in the 30's always so never see any differences there to judge.

The reason for REALLY wanting to move the air around with a fan and keeping your room temps lower are two important things to me because they directly affect how low I can get my light to the plants. And we ALL know the lower the better there. ;)

Ps Opie: my fave little dogs: chihuahuas, pugs, bostons, papillons, and cairn terriors. :D (and mongrels of course!!!)

Quote:

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Originally Posted by Opie Yutts

Oh here we go:

...evaporating water cools the leaves below that of air temp...

http://www.plantstress.com/articles/...SI_phoenix.pdf

It's a little technical, but it's interesting and answers some questions.

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LIKE I UNDERSTOOD THAT AT ALL..............:D:D:D

Actually I'm just parroting what my hydro guy told me (when he sold me the temp gun :D) but I would trust my hydro guy with my life. He IS.....GOD. :thumbsup:

Learning stuff nearly daily. Thanks Weedhound.

Tomorrow I search cairn terriers. Mongrels from the animal shelters around here cost more than pure-bred from breeders. Time for sleepy-bye now.

ok well i got a little problem i use my closet to grow 4*4 got my hps/mh hanging from the middle but i have no way i could ventilate this.

If i cut a hole in the door for exause it would be a little apparent what im doin

if i keep the door open, after 4:30pm when it gets dark out, from out side my windows are lit up like a fuckin christmas tree

so i keep the door shut and my thermometer says its max is usaly 102f but i try to keep the humidity up (in early grow stage) so they dont burn up

but im gunna need to fix this prity soon

any ideas?

There's only two ways I know about......ventilating (which you talked about...holes in door etc..)....or use cooler lighting like cfls or something along that line which will lesson your yield but may be the way to go here. Those are the only two ways I can think of but perhaps others have better ideas. :)

yea, but i would hate to have bought my htg light kit for nothing <- love that light

Imo....the lights make your plants happen. But it IS amazing how much heat they create isn't it?

When I first got my 1kw light I brushed off my hydro guys talk about ventilation and discovered the hard way (as you have) about the heat they create. In a 12 x 16 room WITH central a/c AND a window a/c I STILL had terrible issues keeping the temp down.
Ventilating the light was the only thing that worked for me....and it worked GREAT!!

Good luck....hope you find the answer. :)

Does your closet ceiling lead to an attic? For a grow in a 4x4 area, you could probably get away with a smaller exhaust/odor reduction system, which would also be easier to conceal. Ventilating fresh air in could be as easy as keeping a fan trained on the opened closet door. Vortex, or "Vornado" fans are great at circulating air around a room. Anyway, this would really cut down on your heat problem, which isn't good for your plants.

nope just a closed room