VPD for flower ? Help

[Wzrdovoddz]

Hey,

Does anyone know if the VPD is different for flowering as opposed to veg ? And if so what the VPD chart for flowering ? Thanks

 

[twalte]

hope this answers your question.

 

[Wzrdovoddz]

hope this answers your question.

It absolutely does. Thank you

 

[JohnDee]

Wzrd,
I'm a fairly low tech guy...but to use vpd accurately...you need an infrared laser meter to measure leaf temp. The temp scale in the chart you just downloaded is probably leaf temp and not room temp. Hell...I'm not even sure it matters...but thought i'd mention it.
JD

 

[Wzrdovoddz]

Wouldn’t leaf temp be pretty close to room temp ?

 

[JohnDee]

Wouldn’t leaf temp be pretty close to room temp ?

Pretty close...if that's what you're shooting for. Remember infrared from HIDS heats up leaves...so I'm guessing they used leaf temp for a reason
JD

 

[greg nr]

The chart is assuming leaf temp 5 degrees cooler than room temp. It will be different for led.

Remember transporation (evaporation) is a cooling process so the leaf will be cooler than the room. Under hid, there is lots of infrared so the leaf temps will be higher.