And done! Back to that 16-12” distance from the lights.
On a side note I think I am going to start upping the nutes a bit. Tested my ppm today for the first time ever and it came in at 648 using 4.5g/gal of the MC. Everything I’m seeing gives a range of 800-900 ppm and with the amount of light they are getting and looking at the color of them I think I can push my ppm into the mid to upper end of that. I’m also going to add in a dose of Bushdoctor and roll the next 2 weeks like that and then reevaluate at that point.
Will do an official update tomorrow.
You have an "uneven canopy", with three plants making up the canopy. The tallest plant will receive the most light, assuming the the PPFD is consistent across the light. But it's not. Most light have signficant differences in PPFD, at the commonly used hang heights. In your situation, I'd move my plants around to take advantage of that.
I'd move the tallest plant well away from the center of the tent and put the two smaller plants in the highest PPFD areas around the center of the tent. You're using two lights so the PPFD map will look different than the one
at this link but, my hunch is that you'll have two areas with the highest PPFD, those areas being directly under each light or about 1 from the center of the tent. That's a SWAG on my part - your light meter will let you know.
The reasons to move them is simple - there's a direct, almost linear relationship between the amount of light and crop quality and crop yield and, second, a small difference in distance from a grow l light results in significant reduction in PPFD.
Cited paper attached.
From the paper:
When I take light readings, I sample enough points represent the canopy. My plant is in day 53 and it's 2' x 2' x9" tall. It's a photo (I stopped growing autos because they tend to grow outside of my tent), that's been topped and LST'd.
By sampling nine points, I get this PPFD/DLI map.
By plotting the data like this for your tent and your plants, you'll be able to adjust the location of your plants so that they can all maintain good light levels. Cannabis
is a light whore loves light and, assuming that the rest of your grow is in good shape, turning up the dial to give your plants more food is an easy way to improve your grow.
