Quantum board question

[Hdinkleman]

hey so i have another post where im trying to grow lb plant, but question is this—-

my hlg 240 is currently running at approx 50% power( 200ish watts)
its causing the tent heat to be around 77-78 F
is the ultimate end all be all PAR and PPFD?
will i get the same results running the board at 10-20% (and the tent being cooler) and putting the light closer to the plant, rather than at 50% ( and the tent being hotter) but raising the light up further from the canopy?
i understand the closer the light is, the less overall footprint of the light is, but im only growing one plant.
so basically my question is, will i get same results running the lights at a lower power closer to the plants canopy so i can maintain a cooler tent temperature?

 

[Guy Cavallero]

Let's see if we can get some QB help.
@Scrogdawg, @KCCO 77, @Pennywise....

 

[Rifleman]

Cannabis grows nicely at 78F, don't sweat it.

 

[Hdinkleman]

Cannabis grows nicely at 78F, don't sweat it.

im getting a few taco leaves on the two uppermost node leafs which i believed was a sign of heat stress?
its 79.7 F on a therm i have hanging on the side of the tent 5” higher than the leaf canopy
i thought lower temps was good for flowering?
if i push the board any higher than 50% we are talking temps higher than 80 and i have low humidity anyways even with a humidifier on
so basically my question is, will i get same results running the lights at a lower power closer to the plants canopy so i can maintain a cooler tent temperature? does it matter at all how intense the light is or is the par/ppfd the end all be all, so basically can i just put the board 10” away from the top of the canopy at 10% and have the same results as if i ran the board at 36” at 100%? ( figuratively speaking, just threw those two %’s and distances randomly)

 

[Hdinkleman]

actually nevermind forget that i found out the answer
am i correct in assuming that unless i have co2 supplementation i dont want/need 800+ ppfd?
ive got the rough calculation to run the board at 700ppfd at 25% power which keeps my temperature cool enough

 

[Stunned]

you're getting 700 PPFD at the canopy @ 25 % power?
that doesn't sound right
how far away is the light?

 

[Chris Scorpio]

I think something is wrong

78f is a great temp, I run my similar bds at 20-24" away at about full blast, no issues at all

I have a PAR meter and am around 300-450 depending on location

Do u have an actual PAR meter

 

[Hdinkleman]

I think something is wrong

78f is a great temp, I run my similar bds at 20-24" away at about full blast, no issues at all

I have a PAR meter and am around 300-450 depending on location

Do u have an actual PAR meter

no i dont, im using a par calculator, thats why its only a rough estimate

https://dev.edman007.com/~edman007/pub/par-dli-cal.html

25% power im estimating is only 185 watts

 

[Hdinkleman]

you're getting 700 PPFD at the canopy @ 25 % power?
that doesn't sound right
how far away is the light?

this is 25% power at 24” according to the calculator

 

[Hdinkleman]

I think something is wrong

78f is a great temp, I run my similar bds at 20-24" away at about full blast, no issues at all

I have a PAR meter and am around 300-450 depending on location

Do u have an actual PAR meter

yes at full blast at 24” according to the calculator the ppfd is 881, so that sounds about right
im just trying to find out how to keep my temps lower than 80 F

 

[Chris Scorpio]

yes at full blast at 24” according to the calculator the ppfd is 881, so that sounds about right
im just trying to find out how to keep my temps lower than 80 F

Why

77-82 is a good temp

Don't sacrifice light because yer afraid of a few degrees

I grow upwards of 88-90 in summer, no issues at all

 

[The70’s]

Is ur grow space ventilated ?

 

[Virgin Ground]

On that calculator you have your fixture style set to cfl.

 

[Hdinkleman]

Why

77-82 is a good temp

Don't sacrifice light because yer afraid of a few degrees

I grow upwards of 88-90 in summer, no issues at all

ok, as long as its ok during flowering its fine with me, im not worried about the temps now during veg, im just trying to plan ahead a little so i dont have a “oh fuck” moment when i start flowering and didnt prepare when i had a chance

 

[Hdinkleman]

On that calculator you have your fixture style set to cfl.

on that calculator its the correct option
read the entire line, or just check out the calculator and youll see what it says

 

[Hdinkleman]

Is ur grow space ventilated ?

yes, 4” inline exhaust with the carbon scrub
2 small fans, one blowing for plants, one blowing directly on the driver

 

[Hdinkleman]

you're getting 700 PPFD at the canopy @ 25 % power?
that doesn't sound right
how far away is the light?

0% is 135 watts
25% on the driver is approx 172.5 watts
50% is 210
100% is 280 watts

 

[Chris Scorpio]

On that calculator you have your fixture style set to cfl.

on that calculator its the correct option
read the entire line, or just check out the calculator and youll see what it says

I agree, I think your using the wrong option

 

[Chris Scorpio]

my hlg 240 is currently running at approx 50% power( 200ish watts)

Are you reference to the Driver here or the QB bds?

If driver, what is the full driver description and the boards yer using

Are u plugging in the driver to a watt meter to determine actual watts pulling from the wall

 

[Hdinkleman]

I agree, I think your using the wrong option

theres only two options and neither of them change the values given.
one is spherical, as in cfl or house bulbs, other is rectangular, the values dont chance