screrg Posted June 12 Share Posted June 12 Areet, I've just had all gear I need to tune in my grow from AC infinity and never been into VPD but looking forward to it. Anyone have a vpd chart as I don't know where they're meant to be. Gonna have a play with the app and get the equipment hooked up t the controller shortly so need to know what's what. Any help much apreciated as always. 1 Link to comment Share on other sites More sharing options...
Military Grade Posted June 12 Share Posted June 12 @screrg 1 Link to comment Share on other sites More sharing options...
MindSoup Posted June 12 Share Posted June 12 @screrg your running LED yeah? LSTs will be a lot higher with HID. 1 Link to comment Share on other sites More sharing options...
Larry Badgeley Posted June 12 Share Posted June 12 Great chart to have. I'm 3 weeks into flower and my room temp is 24c and 65% RH with a VPD of 0.98 kpa which is spot on. My extraction is on 9 which is pretty noisy but as it's so awful outside with RH at 78%. Hopefully this weather will change to a more drier atmosphere when I approach late flower. I'm running fast versions which apparently should take 7 weeks. 1 Link to comment Share on other sites More sharing options...
Flamedodger Posted June 12 Share Posted June 12 As @MindSoupmentioned. Leaf offset temps will be roughly -2° for LEDs. if you haven’t got an IR thermometer, it’s probably a good idea to get or borrow one if you’re using sodium, hid etc I’ve hacked my ACI controller to home assistant and get continuous reading on a chart; Sensor positioning is also pretty important. 4” above my canopy I have a sensor and it’s almost always drier and hotter than on the fan sensors which I keep at the same height as my buds. Bury it in the canopy and it’s a right old game getting environment right 2 Link to comment Share on other sites More sharing options...
screrg Posted June 12 Author Share Posted June 12 12 hours ago, MindSoup said: @screrg your running LED yeah? LSTs will be a lot higher with HID. Aye, PAR+275. Is the chart for LEDs? @Flamedodger My probe is pretty central and at canopy height. I've got the humidifier pointing towards the circulation fan as much as poss to try and spread the joy. They look happy so so do I. They're mid veg and at 24C and 70% so spot on according to Military grade's chart. Even if I have to take 2C off the chart for the fact they're under LEDs it's still spot on. I'm getting brutalised at work atm so just having a quick check but off Sunday so will have a look at setting the controller up and dialling things in when i have time. I've got the app soo will be like a kid at Xmas when I can have a check on them any time What do you mean sodium, HID? I'm in mud in fabric pots using grower's ark nutes. I fed them for the first time yesterday as it looked like they'd used up all the nutes in the soil and have defo rooted out so looking for some good growth here on in. I super cropped yesterday to get them growing the right way and get the tops down to let the other areas get some light. Snapped one and shit mesel but taped it up and looks like it's glued itself back together 1 Link to comment Share on other sites More sharing options...
Flamedodger Posted June 12 Share Posted June 12 20 minutes ago, screrg said: What do you mean sodium, HID? Lights, they run a lot hotter and radiate heat, so high leaf offsets. In the ACI app don’t forget to set a min fan speed, if it’s zero it will turn off 1 Link to comment Share on other sites More sharing options...
Shumroom Posted June 13 Share Posted June 13 There’s a site that allows you to create VPD charts with your own leaf offset temp. I seem to recall the company is called Pulse, should be found by searching the web for “custom VPD chart maker” Atb 1 Link to comment Share on other sites More sharing options...
screrg Posted June 13 Author Share Posted June 13 3 minutes ago, Shumroom said: There’s a site that allows you to create VPD charts with your own leaf offset temp. I seem to recall the company is called Pulse, should be found by searching the web for “custom VPD chart maker” Atb That looks spot on shumroom. Thanks as always. 1 Link to comment Share on other sites More sharing options...
Shumroom Posted June 13 Share Posted June 13 Nae tother a ball 1 Link to comment Share on other sites More sharing options...
Larry Badgeley Posted June 13 Share Posted June 13 @screrg Setting up the controller is very easy and a fantastic bit of kit. First time I've used it this grow and it's been a real help in getting the environment dialled in. 1 Link to comment Share on other sites More sharing options...
Military Grade Posted June 13 Share Posted June 13 Tbh I stopped caring about VPD after two grows, didn't make any noticeable difference other than a raise in the risk of bud rot, so I keep now keep my environment close to the ideal VPD without trying but more focused on leaning more to the bud rot prevention side Someone recently explained how most us misinterpreted what VPD is, it's a by product rather than a target to aim for or something along them lines , hopefully they see this thread and can explain it over again. 3 Link to comment Share on other sites More sharing options...
MindSoup Posted June 13 Share Posted June 13 53 minutes ago, Military Grade said: Tbh I stopped caring about VPD after two grows Yeah I stopped caring, tried measuring LSTs with the old laser thermometer thing, realised that even one leaf had variation of 2 degrees across it's surface, thought to myself "what a load of nonsense" carried on as I was before . 4 Link to comment Share on other sites More sharing options...
greenvigilante Posted June 13 Share Posted June 13 4 hours ago, MindSoup said: Yeah I stopped caring, tried measuring LSTs with the old laser thermometer thing, realised that even one leaf had variation of 2 degrees across it's surface, thought to myself "what a load of nonsense" carried on as I was before . add to that the thermometer guns have a 2c tolerance aand u could be 4c out on any leaf 1 2 Link to comment Share on other sites More sharing options...
MindSoup Posted June 14 Share Posted June 14 Good point . If anyone can suggest a practical and accurate way to measure LSTs then I'm all ears. 1 Link to comment Share on other sites More sharing options...
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