Jimski
Member
Hello everyone. First time launching a grow and I have some questions.
Perfecting Cannabis seems to be a very technical process at the high ( hehe ) end but some previous technical training is screwing with my head. In lab work we always had to tailor our math to follow whats called " significant figures". In other words if your current measurment includes multiple variables that measure 1.012 and 1.1 than your answer has to be a single digit to the right as this " significant figure" will not allow a thousands answer as your measurement can not express a value more precise than your weakest measurment.
This is my problem. Most of the current temp and humidity sensore are plus or minus 3%. Some are as high as 7% and some manufacturers are lying their collective butts off about accuracy and precision of the instruments. Accuracy and precision are 2 different things and should not be mixed up and you need both. Precision is repeatable function accuracy is function based on established measurements.
You can have a rifle that is very precise like every bullet hole touches the other hole but with poor sights you hit the same spot 14 inches to the left, not very accurate
Case in point vpd. I have seen charts that have you adjust vpd based on leaf temp. I can not see this actually working due to temp probes that can not be base lined to match. Air temp is one type of sensor and they have to be calibrated. Touch sensors are another and infra is yet another. If your temps are not correct for actual the chart is wrong.
The second is sensor drift. Much like calibration of a ph tester you will find that syncronizing a system for inside and outside temp and humidity difficult or impossible if you use a $9 amazon gauge set. You will need a lab quality temp and humidy gauge. Using a lab gauge will get you set up but I have sent 2 systems back because the sensor drift after calibration will not last a week. If your humidy and temps drift your vpd means squat.
Basically I can not see any of the grow tent systems being able to adjust for all these problems and them selling this as a system just seems to be false.
Not giving up on tent grows but the controllers will be in manual mode and i have lab grade manual temp and humidity for both in and out and will just do the math. Just wish I had not gotten the kits with the preset grow number controllers and wasted my time.
Now the big question. Overthinking this stuff? Pot is easy to grow? Very forgiving? I can follow a plan and the mental exercise had been enjoyable but if I spend 2 months gathering data and building a grow to produce caca I will be kinda pissed.....
Perfecting Cannabis seems to be a very technical process at the high ( hehe ) end but some previous technical training is screwing with my head. In lab work we always had to tailor our math to follow whats called " significant figures". In other words if your current measurment includes multiple variables that measure 1.012 and 1.1 than your answer has to be a single digit to the right as this " significant figure" will not allow a thousands answer as your measurement can not express a value more precise than your weakest measurment.
This is my problem. Most of the current temp and humidity sensore are plus or minus 3%. Some are as high as 7% and some manufacturers are lying their collective butts off about accuracy and precision of the instruments. Accuracy and precision are 2 different things and should not be mixed up and you need both. Precision is repeatable function accuracy is function based on established measurements.
You can have a rifle that is very precise like every bullet hole touches the other hole but with poor sights you hit the same spot 14 inches to the left, not very accurate
Case in point vpd. I have seen charts that have you adjust vpd based on leaf temp. I can not see this actually working due to temp probes that can not be base lined to match. Air temp is one type of sensor and they have to be calibrated. Touch sensors are another and infra is yet another. If your temps are not correct for actual the chart is wrong.
The second is sensor drift. Much like calibration of a ph tester you will find that syncronizing a system for inside and outside temp and humidity difficult or impossible if you use a $9 amazon gauge set. You will need a lab quality temp and humidy gauge. Using a lab gauge will get you set up but I have sent 2 systems back because the sensor drift after calibration will not last a week. If your humidy and temps drift your vpd means squat.
Basically I can not see any of the grow tent systems being able to adjust for all these problems and them selling this as a system just seems to be false.
Not giving up on tent grows but the controllers will be in manual mode and i have lab grade manual temp and humidity for both in and out and will just do the math. Just wish I had not gotten the kits with the preset grow number controllers and wasted my time.
Now the big question. Overthinking this stuff? Pot is easy to grow? Very forgiving? I can follow a plan and the mental exercise had been enjoyable but if I spend 2 months gathering data and building a grow to produce caca I will be kinda pissed.....