Changing LED mid grow.
- Thread starter Growtician
- Start date
Hollatchaboy
Well-Known Member
A lot of guys still do it that way.
Growtician
Well-Known Member
600 ppfd/38 DLI
Growtician
Well-Known Member
Thank you. It’s my second light and I sure if different roles applied to LED
Hollatchaboy
Well-Known Member
Most led are full spectrum.
Growtician
Well-Known Member
I meant rules lol
The XS 1550 Pro will let you feed your plants well.
<bias> I'm a high light grower - 1kµmol by day 30, autos and photos at 80mol until flip. Photos at 1100µmol ± and autos at 70-80DLI until chop. I adopted that practice after my third grow (2022) based on the fact that the yield of a cannabis crop increases in a linear/almost linear manner (depending on whose research your read). </bias>
I would recommend that you increase your PPFD. Per above, more light=more weed. Cannabis will grow at light levels between 64µmol and 800-1100µmol. As long as light is the limiting factor, you can pick any PPFD between those two and that will, barring mishaps, drive yield.
Below is a table I created from the cited paper. In their research, the yield curve is rolling off but there's something like a 40% difference between 600 and 1k.
If I were in your shoes, I'd raise PPFD by 100µmol per day for the next few days but check for light avoidance each time you increase the light level. Typical symptoms are that the leaves at the top of the canopy will "canoe" ("taco") or the leaves will rotate around the petiole, similar to how a Venetian blind opens and closes.
Why increase the light level? More weed.
Why not? Many growers have a fear of harming their plants.
It is very, very hard to damage a cannabis plant with an LED grow light. Sure, some leaves will taco so turn the dimmer down 5% or raise the light 1-2" and you're good to go.
I routinely give my plants too much light in early or mid-veg and that happens because I try to get my plants to 1kµmol by day 30. When I see the leaves taco, it's easier for me to just lower the input wattage and I don't give it second thought.
You've grown in CMH/HPS?
Growtician
Well-Known Member
I’m actually getting a little more because I calculated at 18hours of day instead of the 20 that it gets. That’s about as good as I can get it, the light is 12 inches over the canopy and is at full blast, no dimmer. Also a reason that I wanted a stronger light. Hoping to maximize my yields with a better light and maybe more nutes.
I’ve only grown with this specific LED. New to the game as it’s my 4th grow….maybe 5th.
You gave some great info. I think I found your post about this on another thread which got my gears going on a stronger light.
The new light has a dimmer but you won't be using if for this grow.
"4th grow….maybe 5th." - appreciate the info. I was thinking "How does a newbie grow an amazing canopy like that!".
Even though you're bringing in the new light about ⅓ through the grow, you'll get a good boost from it.
"more nutes." - as long as nutrients are in the sufficiency zone, the only impact of additional nutrients is to remove more money from the growers pocket and to move the grow closer to the "toxicity" range.
Over the course of a 120 day grow (my grows always run very long), I do the initial res at 0.6 EC, another one when I go to flower at 1.2, and mid-flower I do a res at 1.6.
"You gave some great info. I think I found your post about this on another thread which got my gears going on a stronger light."
Uh oh, busted! (Hmm, maybe I shouldn't use that term with this crowd, eh?)
Yes, I'm…"enthusiastic" about growers using lots of light.
coreywebster
Well-Known Member
Yeah, just crank it to 100% and flip it
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