Delps8
Well-Known Member
22k lux ≠ 490µmol ("PAR").Half way through day 9 !
Day 4 for Hawaiian Snow..
Things are finally starting to happen
Picked up a bag of coco coir and one of perlite today !
I do not water on a schedule but it just worked out they all needed it at the same time, a cup of 1.5g/gallon of MC was just enough for some run off...
Plant height temp @ 82, room temp 76.5, rh 40%. Exhaust fan is running intermittently but it was 90 outside today. Larger room where the intake air comes from was 73...
Putting the solo cups on saucers/elevators raised their height by 11" and lux to 22,.000. 490 par ?
Plant distance to bars is 17". Dimmer knob is at 2 out of 10 !
Does not compute but I'm going to leave it for now and see what happens
Cheers
22k lux from your light is about 330µmol which is a good amount of light. I suspect that plants that young wouldn't tolerate 490µmol very well.
This is the spectrum for your light and it looks to be, at most, an even balance. If the blue peak were higher, I'd be tempted to use 0.0145 for a factor but 0.015 is the common factor for a "white" LED. Either number will get you in the ballpark.
While you're in the ballpark for good light, your RH is brutal for a young plant.
I accept that some growers don't "believe" in VPD and that's fine but it doesn't change the fact that plants live and die by VPD. At 82 and 40, your plant is forced to give off twice as much water at is considered optimal for a seedling/young plant.
The leaf temp is good but your plants would be a lot happier if RH was in the high. If you can't get VPD back in range, your first nutrients should be really dilute because your plants are taking up 2x as much water as normal. My first nute batch is EC 0.6 but, if my VPD was this high, I'd go in at 0.2 or a bit less.
I've attached a document I wrote re. converting lux conversions. It might "shed some light" on why I came up with the 0.015 factor.