Its unlikely raising your light caused plant to foxtail. This would be more from having it to close or other stress on plant. 65f is pretty low too. With leds usually recommended canopy temp is usually around 80f. If neexpistils are in the form of foxtails you can pretty much disregard them.
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Right @dbrn32 , I was referring to that fact that I first lowered the lights to 8-10” for a few days before I realized that the periphery (where I’d trained the buds to grow) gained light energy up a bit higher. So then I raised them, from 8-10” up to @14”. I do think though that my mistake came when I left lights+ extra tights on all night with temps @89’F. This CBD plant has been very rigorous from the start. She is the only one of the three that decided to erupt in systemic fox tails late in flower. Now I’m just trying to get on with it, after 13+ weeks in flower. I feel some sort of paradox where I’m seeing @20% amber and beat up trichomes on some inside and lower bud: also plenty of clear trichomes as well. I’m thinking I need to find the balance. I’d like to chop at -10% amber to preserve CBD(18%) but don’t want anxiety producing clear trichomes. Hope this explains the problem better. This is a great place for you help. Thanks to all!
I hear you.
CBD cream+cheese chopped today.
She has lots(6) of 9-11” colas. Should yield 4-5 oz. after @ 1week of drying time. So with 2 100 W. Led quantum panels, in a 20”x36” tent total yield should be @8.5 oz. with the three plants. Which I believe is over one Gram per Watt. Next up I’ll try to get 10+ oz from that same setup. Here’s hoping!
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@dbrn32 @Myfriendis410 Bad news; I found some bud rot in the largest heaviest buds. I did separate all the colas. Then I cut, anything looking grey, white, or brown got cut away and burned in the wood fire. Then I washed with lemon juice/water and peroxide solution. Then hung everything up to dry with the temp up to @68’ F and Humidity down from 56 to @30%. So much for 11” colas. Checked next day and found a bud or two that needed to go as well. I guess I lost about 2/3 oz. or so.
Next time I will not keep working to get the RH in the tent up from -30% to +45% when the temp in the tent goes down into the 50s. I think this was my mistake. Now I’ll have to completely disinfect the tent and the entire area before use again. Live and learn!
Bummer! I would definitely do thorough cleaning.
Plan on doing a bud wash in peroxide:
Thanks! Did so. With lemon juice / water / peroxide, after culling the bad stuff. Dumped any white, grey, or brown buds all the trimmings into the wood stove and cleaned pruning sheers etc…
So I focused on one problem (dryness) ‘till it became the opposite problem (too much moisture) with dropping temps. I’m trying to make sure this horror story won’t be repeated. The best buds I’ve grown so far on such a vigorous plant. What a shit show learning experience! But learn I will. Thanks for your insight.
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Your optimum lighting (with no supplemental CO2) is 850-950 PAR (average PPF)
You do not need 300 watts - read on.
Here is the formula:
Grow space x Required PAR light ÷ Fixture efficiency
So, In order to have 900 average PAR in your space (0.45 metres squared):
0.45 x 900 ÷ 1.9 (typical quantum board efficiency) = 213 watts required.
The more efficient the light, the less power you need eg Migro Array 240watt (2.37 efficiency) in the same space would be:
0.45 x 900 ÷ 2.37 = 170 watts - clear saving in power and lifespan AND you can get the light closer to canopy as it’s not on full power.
Compare this to a HPS with 1.3 efficiency:
0.45 x 900 ÷ 1.3 = 311 watts required.
Thanks @MrMagoo! So Atreum lists the Hydra 1000 at 2.7 efficacy. So with this formula, that comes out to 150W right? So with 2 Hydra1000s pulling 110W each equaling 220W no more light is needed for the 22”x36” tent. That was the conclusion I’d come to, but the formula confirms it for me. Now I just need to get my grow environment and nutrient schedule all in focus to completely fill that space with sticky buds.
Be extremely cautious about the manufacturers listed efficiency, it’s usually extremely misleading - use independent reviews on YouTube to get the actual efficiency of a fixture.
The most efficient lights on the market eg Migro Array have an efficiency of 2.4 and this is outstanding - so apply caution to anyone marketing 2.7
I would amend one thing I said, if you are growing Autoflower you will get excellent results with an average PPF of 750 (micromoles per metre per second) due to the fact they are under lights for longer than photoperiods and therefore don’t need the same intensity. For photoperiods I would stick with 850/900.
So for 750 par in your grow space for an autoflower:
0.45 x 750 ÷ 2.0 (an average efficiency) = 168 watts required.
Yes sir @MrMagoo that 2.7 PPE is independent lab tested, but at 220 V. So if you subtract .5% for the V. Boost over 110V, you still get 2.56 PPE. I think! This is from Aldo Peppers YouTube review. I believe these are weeds worth wading. The tech is gaining so fast that it’s hard to keep up. I’ve grown plants under a Hydra1000 and a generic 100w quantum panel side by side. Both were drawing @100W. Though not particularly scientific, the plants grown under the Hydra did get @33% larger buds. Thank much for your valued insight.
Only an indication.
Even if you use the same strain it’s not conclusive. Every plant starts with its own set of genetic code, and can grow very differently all things equal.
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@6stringT be careful… you’re looking at the PPF efficiency which, as you say, is 2.7 on their website - however, they don’t list the PPFD/Watt efficiency (usable PPF) or system efficiency - the one that matters most. The confusion surrounding these figures tends to suit manufacturers when they report numbers that appear too good to be true.
MIGRO and HLG are class leaders in system efficiency and they are around 2.4-2.5
You’ll find that system efficiency for the Atreum is far lower that the PPF value you’re reading from their site. When you have it, run it through the above formula.
Thanks for the info @MrMagoo. I looked on Atreum and HLG web sites and found: Atreum: 110W.
PPF 297 Umol/s
PPF efficacy 2.7 umol/j
HLG 110Rspec. : 95W.
PPF 220umol/s
Par efficiency: 2.41 umol/j
I guess the extra 15w and using 220v for the equation makes the difference. Anyway I like the specrum with the Atreum with the little boost 730-740nm and good UV. I was looking for USA Company. They are. And HLG is too. But I’m guessing that 99% of the components come from China.
I’m sampling some CBD C+C right now so my apology for any confusion.
Holy sh!t! Y’all are reminding me how much and why I hated school!!! Way way way over my head with all this technical stuff… More power to ya though… Y’all rock n’ stuff lol