Can a plant have to much P.A.R. in veg or just run it Max ?
- Thread starter 4:20am
- Start date
Tracker
Well-Known Member
You can inch the lights closer, a little each day, until you see signs of light stress. You can definitely overdo it and fry the plants. Above 900 umol/(s x m^2) ppfd you're getting diminishing returns for extra light intensity on the canopy. That is about 56000 lux on a 3500k CRI LED (if you use a lux meter). I run my lights so that the highest reading (during flower) at the highest point on the canopy is 52000 lux. During veg I max it at 50000 lux at the highest point.
When you're growing outdoors, when the sun is directly overhead in summer, its upwards of 120,000 lux over 2000 on ppfd, but that only lasts for a couple hours.
When you're growing outdoors, when the sun is directly overhead in summer, its upwards of 120,000 lux over 2000 on ppfd, but that only lasts for a couple hours.
Rocket Soul
Well-Known Member
I'd advice a lot of care on re high intensity in veg your first go with a high intensity led. Especially if your nutes are in the soil
You may wanna have some calmag or Epson handy. It's easy to freak your plants with leds, especially in veg, well at least for us.
Also read up on DLI daily light integral (I think?)
It goes into how much total light will handle at set points of development.
You may wanna have some calmag or Epson handy. It's easy to freak your plants with leds, especially in veg, well at least for us.
Also read up on DLI daily light integral (I think?)
It goes into how much total light will handle at set points of development.
Tracker
Well-Known Member
Mas info.
This shows the average DLI in the given month in different regions of the US. In other places in northern hemisphere you can get a good approximation by matching a location on your latitude.
OSBuds
Well-Known Member
I do not, my reference info is small. You have great resources, thanks for sharing!
BonnMac
Active Member
Indeed.
I thought the same thing, myself.
Might be beginner’s luck, but I went all in under Bugbee’s recommended growing medium of 50% peat / 50% vermiculite. All under LED with his reco 20-10-20 fertilizer.
Right out of the gate, as soon as the seedling sprouted, I had 1000 μmol on her both throughout veg and reproductive.
My first grow was Blue Mystic. Not sure if that gave me some rookie forgiveness but after watching a lot of Bugbee videos, I felt pretty comfortable with the parameters.
should also clarify. Growing 2 plants in a 2x4x5 tent. No added CO2.
Ps. I too, want to visit the Canary Islands!
Last edited:
Tracker
Well-Known Member
Eso....truth
BonnMac
Active Member
Ahaha.
True. Although with my experience, where I’ve become patient with one thing, I’ve totally become impatient with something else I used to have patience for.
Tracker
Well-Known Member
This too is truth
BonnMac
Active Member
I’m sorry for the loss of your friend.
He must have been one hell of a guy if I resembled him. Probably a good looking guy? : p
I live on the west coast of Canada and would love to grow outdoors but it's not that feasible, at least for me.
Total respect to you and to those who grow under the sun.
You live in one of the best places to grow outdoors.
Doug Dawson
Well-Known Member
Yes, you can give a plant too much light or too high an intensity.