Star Dog
Well-Known Member
What do you think I'm making it up?
It's a fact regardless what you think, when I say something it's because it's happened.
I can tell you right now my leaf and ambient are the same.
HLG 600 RSPEC, heat?
- Thread starter Sqwee
- Start date
It's a fact regardless what you think, when I say something it's because it's happened.
I can tell you right now my leaf and ambient are the same.
Billy the Mountain
Well-Known Member
I still don't think its possible for a leaf surface temp to be higher than ambient under an LED (at a normal growing height). Leaf surface temp should be a few degrees lower than ambient due to transpiration. If its not, something's wrong.
Star Dog
Well-Known Member
VPD with a range of leaf temps above and below ambient?
Billy the Mountain
Well-Known Member
HPS lights raise leaf temps above ambient due to lots of IR output and have a positive value
LED lights will have a negative value
LED lights will have a negative value
grotbags
Well-Known Member
far red is in some... IR is in none...
grotbags
Well-Known Member
is your IR gun a decent one?, does it allow you to set emissivity?.
i have a cheap one and my leaves are approx -2 to -4 lower than ambient but i dont really trust its accurate, but dont fancy buying a decent fluke one...
Star Dog
Well-Known Member
Emisive sensitivity I'm not sure about but it's a quality thermometer irc the model but it's a leak brand.
I've also a cheap crappy one that reads 3/4c under.
The light in question (Tsl2000) does have ir I assumed that's where the temperature was coming from at 20"
Orb
Active Member
Yes it says ir 730nm which is fine for them to say, 730nm is also known as far red this falls in the region between 700-750nm and we know a lot of its properties already
When I say true IR
IR is categorized as IR-A (780 nm-1.4 µm), IR-B (1.4-3 µm) and IR-C, also known as far-IR (3 µm-1 mm)
So yes I'm sure it has 730nm chips whether you categorise it as far red or ir is your choice
When I say true IR
IR is categorized as IR-A (780 nm-1.4 µm), IR-B (1.4-3 µm) and IR-C, also known as far-IR (3 µm-1 mm)
So yes I'm sure it has 730nm chips whether you categorise it as far red or ir is your choice
Star Dog
Well-Known Member
Whatever but it doesn't change the facts...
thermometer left on the canopy.
Hanging on the wall.
Leaf temp.
Hot spot.
Controller.
The bottom reading is the canopy temperature.
Sincerest apologies to op