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Thread: The best VPD chart online!

  1. #1

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    Default The best VPD chart online!

    Heya,

    Was chatting with some dude on reddit and he shot me this link. It became obvious that this was indeed the best VPD tool I've seen on the web so far.

    VPD is so important. Even if you don't have it locked into the best range, understanding VPD and how it affects your plants is paramount!

    vpdchart.com <----------- check this out!

    (link is safe, I talked to Ice)

    Just thought I'd share as it may be valuable to some others.

    Cheers
    B


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  3. #2

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    I told V8 days ago that was cool to put up.

    Glad ya posted it B.

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  5. #3

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    Yo Barney

    I had a look at tool and it's show way off compared to what ac infinity app says

    For example ac infinity tells me :

    Temp 29 RH 58% VPD 1.66 kPa

    Tool shows me for that 0.66kPa only unknown for me in my tent is leaf temp


    So I assume ac infinity think leaf temp is same as tent temp then it does Vpd in tool match ac app
    Last edited by maxkolonko123; 21-12-22 at 05:30 PM.

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  7. #4

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    Quote Originally Posted by maxkolonko123 View Post
    Yo Barney

    I had a look at tool and it's show way off compared to what ac infinity app says

    For example ac infinity tells me :

    Temp 29 RH 58% VPD 1.66 kPa

    Tool shows me for that 0.66kPa only unknown for me in my tent is leaf temp


    So I assume ac infinity think leaf temp is same as tent temp then it does Vpd in tool match ac app
    With a leaf temp of 29 i get this:

    https://vpdchart.com/#C,58,29,29,0

    If you drag your leaf temp down to 25-26 you can see you are spot on

    Leaf temp are usually 2-6c under room temp. This will be diffrent when you are growing with HPS VS LED. Leds run cooler

    V8
    Last edited by V8; 21-12-22 at 07:21 PM.
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  9. #5

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    Quote Originally Posted by V8 View Post
    With a leaf temp of 29 i get this:

    https://vpdchart.com/#C,58,29,29,0

    If you drag your leaf temp down to 25-26 you can see you are spot on

    Leaf temp are usually 2-6c under room temp. This will be diffrent when you are growing with HPS VS LED. Leds run cooler

    V8
    If iirc the lack of uv on led's keep the leaf temps down too. A lot more new led's have added uv now.

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  11. #6

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    Quote Originally Posted by V8 View Post
    With a leaf temp of 29 i get this:

    https://vpdchart.com/#C,58,29,29,0

    If you drag your leaf temp down to 25-26 you can see you are spot on

    Leaf temp are usually 2-6c under room temp. This will be diffrent when you are growing with HPS VS LED. Leds run cooler

    V8
    As you said I can't really measure leaf temp so I'm sure if my room temp is 29 leaf will be around 22-23 which is spot on

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  13. #7

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    Quote Originally Posted by barney_b View Post
    vpdchart.com <----------- check this out!
    That's mad. It factors in both the ambient & leaf surface temperatures into the equation
    B1unt XIII: Chemdogging & Sour Diesel - https://www.thctalk.com/cannabis-for...post1071304159

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