heat issue

[iliketogrow2]

im running a 125W full spectrum envirolite next to 4 - 20W red spectrum 'grow' floro's. The box flower chamber is approximatly 2X2X2 and only holds one plant at the moment. The chamber is exhausted by 2 computer fans blowing through 90 degree pvc corners. the temperature at the bottom of my box used to be 65 and the canopy (which i keep very close to the bulbs) was about 82.

i recently lined the box with that white mylar stuff. it really increased reflectivity but it also seems to reflect alot of heat. also having the large metal fixtures for the 20W floro tubes next to the envirolite causes the metal parts of them to get pretty damn hot. the result is a very hot canopy about 92-95 degrees. Is this 2 hot for my plants? is it going to slow growth down more or less than moving the plants farther from the bulbs?

a new technique ive been trying is opening my window a crack or 2 when the lights are on brining the temperature down to about 50 degrees (its winter here) and im assuming the temperature of my canopy down about 10 degree or so 2 since cold air is being sucked up the passive intake through a pvc corner at the bottom of the box.

let me know what you guys think thanks!

also does anyone have any shots of what heat stressed plants look like?

 

[JJScorpio]

Are your tops drooping? You should be able to tell by looking at them.

Is the metal parts so hot you can't touch them? If so, you are getting to a point of being dangerous and it needs to be fixed.

 

[Guest]

85 is the limit before it starts getting heat stressed my plants are at 82 gettign fresh air 24/7 though. Heat is a BITCH, your lucky you can jsut crack a window!

 

[ds45]

I think your better off reducing some of your lighting because more light is bad if you can't keep the heat down. It sounds like you had enough light as is for 1 plant, you might not need all 4-20w bulbs. Your plant won't get sick/die from less light, but it will from too much heat. Its not worth the tradeoff because if its too hot your plant will stunt or die and you'll be left with no yield at all. Since your past veg., maybe take out the 125w full spectrum and just use a bunch of 20w red. That way you can add or subtract bulbs to find the right wattage/temp ratio. Good luck.

 

[Guest]

do you have a circulation fan blowing in the cab? i would. add one in if ya don't, your plants will love it. you'll definately need it in flower anyway.

 

[iliketogrow2]

my venting system kind of sucks to be honest id estimate its ACTUALLY exhausting about 10-15 cfm per second. granted my chamber is only 2X2X2. i will find an osilating fan asap.

the plant shows no signs of dropping but this...sortve white residue that forms on the fan leaves, I really dont think are trichomes because it looks much different than the trichs on the spike leaves that come out of hte bud. its sortve like plant dandruff. growth seems totaly normal and healthy other than that, and a couple (2) burnt leaf tips that burned along time ago anyways i think.

the only obvious signs that it is to hot is the speed at which pistills turn amber. i dont think they are 'burning' as described in my 'late pollenation?' thread but simply maturing ahead of time.

ds 45 im not so sure about taking out the 125W envirolite. its the majority of my lumen output alothough it is 6400K. if i run JUSt the envirolite the temperatures are totally fine, and if i run just the flouros its even cooler. I was running just the envirolite for along time but added the red floros in order to add some red spectrum which i understand is really important in flower...

again im pretty hesitant at removing 125W of my 205W grow 3 weeks from harvest...

anybody?

 

[Hal]

I think that heat stress can cause the plant to go hermie on ya too.

 

[iliketogrow2]

i took the enviro out today, but just for today because i wanted to foliar feed and didnt want burn marks. the 'dandruff' is actually really little white spots. i will try to get some shots up or find 1 in my gallery but i think those pics are too old. 'casing' on my envirolite is also broken, means half the bullbs wiggle, tried to return it but the headshop wouldnt take it so im sending it back to the manufacturer.

 

[Guest]

Sounds like spidermites to me,check along the vein on the underside of the leaves for mites and eggies

 

[Guest]

ltg2, you're already flowering. sorry dude. i gotta get some new glasses , either that or stop posting. lol.
crap. sucks gettin old.
i took my 48 yr old teeth to a new dentist yesterday and had a below gumline scraping. jeezus mary an josef holy mackeral. don't get old, just die young. haaaa.
but i would still deal with ventilation and circulation. best luck.

 

[iliketogrow2]

its really starting to become a problem. either the 80W of red or the 125W of blue has to go. i dont have the money or desire to by a inline exhaust fan right now. i added a osilating fan that keeps the chamber at approx. the same temp everywhere and slightly lower than the canopy temperature before i added the fan.

Opinion poll:
1. remove 80W red
2. remove 125W blue
3. keep the 85-90 degree canopy.

 

[PassionForMaryJ]

A few thoughts on your heat/ventilation issues..

Do you have one more PC fan, maybe a 120 mm, if not 80 mm will have to do, but place that in the center of the cab, and have it blow a little cool air upwards that comes in from your intake, you would probably want to set the lil fan up on something that would bring it a half inch to an inch up off of the bottom of your cab, that way it can pull as much cooler air upwards as possible..

Now that may work, I will warn ya, I am not great on ventilation issues, but I know a little bit..

You mentioned that you are 3 weeks from harvesting, and you still foliar feed?
I stop all foliar feeding as soon as flowering begins, you get risks of having moldy bud (budrot) if you foliar feed during flowering, you want your humidity in there on the lower side, not the higher side...
At most you are just cleaning the leaves off a little, increasing transpiration...

Another thought, do you have your lights on at night, and off during the day?
This I finds works better always, in the Winter the lights on at night help to keep them warmer, and are off during the day when the temps are warmer (provided the sun is out, and it is not too cloudy)..
In the Summer lights on at night works better because it is cooler at night, and hotter in the day, so this works to benefit you both ways yet again...

If your temps get above 85 to 90 F I'd worry a bit, as you say yours are I'd do all I could to lower that a few degrees..

I say check the link in my Sig about Sick Plants by Stitch, there are pics of light burned, as well as all other types of helpful pics and info...

Hope you enjoy your upcoming harvest!!!