Radiant heat vs overall temp?

VincenzioVonHook

VincenzioVonHook

Well-Known Member
Star Dog said:
I don't find any absolute I see canopy temperature equal to the ambient, I've seen it 1.5/2c higher and 1.5/2c lower, it can't just be me, who's checking frequently?

For the sake of being thorough I put a naked thermometer on the canopy 1.5 hrs ago... 540w 20"
View attachment 4940898
Room temperature
View attachment 4940899
Canopy temperature
View attachment 4940897
Hot spot
View attachment 4940896
How come?
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No idea.. I check every time I look in there as there's 5 reptile sensors and a decent hygrometer which are all clearly visible..it seems strange. There's always a spot directly under the lights which is 4-5c more than the average everywhere else. As others said, if I shade the sensor it drops around 4c, and heads towards the ambient average.
So I'm pretty sure it's just the black plastic heating up the small sensors.

I've upgraded to a 6" fan over the 4", and the humidity is a lot closer than it was before in and out, and the light seems to have cooled down a few degrees...probs just bad circulation on my behalf.
 
Star Dog

Star Dog

Well-Known Member
Im glad you got it sorted out, unguarded probes give you some funky readings, I use a piece of cardboard tube with a slot cut into it and that works fine, I've seen someone using a cocktail umbrella it looked neat.
 
G

GrowingAbroad

Active Member
Star Dog said:
I don't find any absolute I've seen canopy temperature equal to the ambient, I've seen it 1.5/2c higher and 1.5/2c lower, it can't just be me that's seen this?

For the sake of being thorough I put a naked thermometer on the canopy 1.5 hrs ago... 540w 20"
View attachment 4940898
Room temperature
View attachment 4940899
Canopy temperature
View attachment 4940897
Hot spot
View attachment 4940896
Environment controller.
View attachment 4940905
???
Click to expand...
You do have a problem tho looking at the edges of you're leafs as they are curling up. Are they the same on the bottom or just the top?
 
G

GrowingAbroad

Active Member
VincenzioVonHook said:
No idea.. I check every time I look in there as there's 5 reptile sensors and a decent hygrometer which are all clearly visible..it seems strange. There's always a spot directly under the lights which is 4-5c more than the average everywhere else. As others said, if I shade the sensor it drops around 4c, and heads towards the ambient average.
So I'm pretty sure it's just the black plastic heating up the small sensors.

I've upgraded to a 6" fan over the 4", and the humidity is a lot closer than it was before in and out, and the light seems to have cooled down a few degrees...probs just bad circulation on my behalf.
Click to expand...
Good you figured it out :) Air circulation is one if not the most important things in order to heep the temps at a good level.
 
Star Dog

Star Dog

Well-Known Member
GrowingAbroad said:
You do have a problem tho looking at the edges of you're leafs as they are curling up. Are they the same on the bottom or just the top?
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Same down the plant,
Idk what the cause of it is but it's not temperature.
Apologies to op for hijacking.
 
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G

GrowingAbroad

Active Member
Star Dog said:
Im glad you got it sorted out, unguarded probes give you some funky readings, I use a piece of cardboard tube with a slot cut into it and that works fine, I've seen someone using a cocktail umbrella it looked neat.
Click to expand...
I usually use a piece or cardboard with a small hole and have the reader under it but the umbrella is a good one, going to remember that one for net time. Pictures wil look pretty funny i geus with some umbrella's in between te plants haha.
 
Star Dog

Star Dog

Well-Known Member
GrowingAbroad said:
When the serrated edged of the leave curls or tipped up like that, it's often a sign of temperature stress, overwatering/root problems or extreme humidity levels. You had any of those problems?
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Ok then cheers @VincenzioVonHook lol

No none of the
above?
Ec stable to 0.1ec , ph 6.0/6.3 temperature 25.5/26.6c over 24 hrs, and 58/64% humidity over 24hrs, what do you think?
 
G

GrowingAbroad

Active Member
Star Dog said:
Ok then cheers @VincenzioVonHook lol

No none of the
above?
Ec stable to 0.1ec , ph 6.0/6.3 temperature 25.5/26.6c over 24 hrs, and 58/64% humidity over 24hrs, what do you think?
Click to expand...
Ec and Ph look fine to me. Do you also test your runoff once every 1 or 2 weeks in order to adjust what you're giving?
Are you growing in soil or another medium? If in soil i would recommend spiking up you PH a little bit tbh.
Nutrient-Availability-Scale.jpg
As you can see on the chart ph levels between 6.5 and 7.0 are best when using soil in order to have to best nutrient uptake. At the levels you're at Magnesium, Calcium and Phosphoros uptake are pretty low and could be better. This is if you're growing in soil of course. Don't seem to recall what lights you're using? If it's LED then Magnesium is way more important then while using HPS.
 
Star Dog

Star Dog

Well-Known Member
GrowingAbroad said:
Ec and Ph look fine to me. Do you also test your runoff once every 1 or 2 weeks in order to adjust what you're giving?
Are you growing in soil or another medium? If in soil i would recommend spiking up you PH a little bit tbh.
View attachment 4940961
As you can see on the chart ph levels between 6.5 and 7.0 are best when using soil in order to have to best nutrient uptake. At the levels you're at Magnesium, Calcium and Phosphoros uptake are pretty low and could be better. This is if you're growing in soil of course. Don't seem to recall what lights you're using? If it's LED then Magnesium is way more important then while using HPS.
Click to expand...
Tbh bud it's not a problem I'm concerned with I'd probably do more damage trying to fix it for not much difference I'll catch it next time.
I'm using led it's my 1st led grow as it happens so I know it's got some rough edges that need to be knocked off.
I'm using coco and feeding 3x daily and yes lol I do check the run off frequently 1.2ec in 1.2ec out with 12/17% run off, you can probably tell I've had too much time on my hands :-)
 
G

GrowingAbroad

Active Member
Star Dog said:
Tbh bud it's not a problem I'm concerned with I'd probably do more damage trying to fix it for not much difference I'll catch it next time.
I'm using led it's my 1st led grow as it happens so I know it's got some rough edges that need to be knocked off.
I'm using coco and feeding 3x daily and yes lol I do check the run off frequently 1.2ec in 1.2ec out with 12/17% run off, you can probably tell I've had too much time on my hands :-)
Click to expand...
Never mind my other response then seeing you're growing in coco, That's something i know "absolutely zero" about :)
 
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