GreenVision Posted 10 hours ago Share Posted 10 hours ago Hi all, a little background info, I crossed some plants a few years back and during a large pheno hunt found a plant I absolutely love and I've been using cuts ever since. Its been a few years now and I had what I suspected were vigour issues possibly down to me taking cuts from cuts or just me... Fast forward to my current crop and they're looking the best they have in quite a while, I'm all but 3 weeks into bloom now and they've stopped the stretch. I think the change in soil and lights has helped them come back to life. I now have 6 Lumatek ATS 300w pro LED's above a SCROG, and the LED's are currently set at 75% and about 35CM above the canopy. My question.. Do I leave them at the 75% or should I raise them up a little and go full metal jacket? Would I loose any yield to only having them at 75% over the 100%? Kinda stuck on this one, on the one hand I think yield will drop slightly not having them up full as there will be less light, but on the other hand if I turn them up and they freak out on me I could end up stressing the shit out of them and not only lengthen my bloom phase but possibly loose yield to stress and over lighting. The LED's are pretty forgiving being a smaller unit, I think even at 100% 40cm above canopy they don't go above the recommended 1000 ppfd at all. The plants however are not so forgiving, since the off this cut has a clear temperament to light schedule and temps, not so much light intensity but when the light go out its one of those that just goes all down and instantly goes to sleep. So I suppose it does come down to yield. Obviously I want to get the max I can so will the dimming down to 75% affect the yield at all? Cheers. 1 Link to comment Share on other sites More sharing options...
Military Grade Posted 9 hours ago Share Posted 9 hours ago Depends on the lights, too high of hot spots on your par map and they can hinder the yield in that area than turning the lights down. Many Growers on here don't run their lights at full power. Link to comment Share on other sites More sharing options...
GreenVision Posted 9 hours ago Author Share Posted 9 hours ago Well the par map on Lumateks site says that at 40cm they are really nice and uniform, plus no areas higher than 1000, which I think the max I should be at without more equipment etc. But at 75% those numbers will obviously be down so Im thinking yield should follow? Link to comment Share on other sites More sharing options...
stu914 Posted 9 hours ago Share Posted 9 hours ago I run my 550w scope leds at 400w giving around 850 - 900 umols overall. Returning between 1gpw and 1.5gpw, strain dependent, Any higher and the upper leaves canoe. Sounds like you're more or less in the sweet spot GV. ATB 1 1 Link to comment Share on other sites More sharing options...
Thai Stick Posted 6 hours ago Share Posted 6 hours ago Depends on the lights but i think you will find that less can be more with led's. My Meiju 240w panels that i run 2 in a tent i have at full power, because the shitty control knobs keep failing and dim th lights to like 30% which isnt great. On some fancy shmancy 1000w led lights i run between 50-75% because theyre super strong. When you run the lights too strong and too close you start to see what looks like deficiencies as the plant struggles to deal with the intensity. That and you wont really see the benefits of using lots of light if youre not supplementing with co2 via tank or Vietnamese worker on exercise bike in the corner. 3 Link to comment Share on other sites More sharing options...
badbillybob Posted 3 hours ago Share Posted 3 hours ago (edited) bang them on full pelt....you know you want to. My last run was an initial run with my new 600w leds i had them on full and the buds were almost touching the bars, only burnt a couple of tops, which were like less than15 cm from the light bars. no canoeing , deficiencies or burning that i noticed. i mean ideally you want to be around the 8-900 umol mark but sometimes life isnt ideal they produced really well too. Edited 3 hours ago by badbillybob 2 Link to comment Share on other sites More sharing options...
SkyRider Posted 2 hours ago Share Posted 2 hours ago General answer seems to be, have a play around....perhaps increase the lights slowly until you see any issues then back it off? Link to comment Share on other sites More sharing options...
Slippy One Posted 33 minutes ago Share Posted 33 minutes ago I’ve found that less is best. Used to get fox tails, extra pistole growth spurts, yellowing that looked like hunger and the buds at the side getting the least light looking the best so easing off the PAR works best for me. Saves a bit too, winwin Link to comment Share on other sites More sharing options...
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