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    Leds causing stress

    So I bought a hlg650r and everytime I put the plants under it they turn pale and droop. I tried hanging them 3ft above the canopy on low and everytime they droop. I then put them under my hps light and they perk back up. Nothing I try seems to work. Does anybody else have this problem? I'm thinking the red is stressing them, but then why are they recovering under hid lights.

    #2
    I have the same experience.

    From what I have cobbled together, under LED's plants like it warmer and more nutes, maybe just calcium is often required.

    My plants went to crap under my spider Farmer and recovered fully under hid's

    My lights on temp right now in the middle of winter is 68-72F.

    Lights off 62-63. We have had night time temps -5 to 10 above lately and I'm in the basement.

    LED is now back in the box until I can get temps to 80, and figure out what else might be required.

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      #3
      I believe some plants are more sensitive than others to the brightness or spectrum of LEDs, has it been your experience with multiple strains or just one?

      I have been running LEDs in small tents for years now and haven’t really had any issues I would attribute directly to the lights.

      Maybe dim them down some or raise them higher above the canopy at first.

      You will get them figured out and once you do you probably won’t look back

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        #4
        Thats intresting. I did notice they do better when its around 85. I just harvested so my rooms are colder. Ill keep everyone updated.

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          #6
          Might be Mg. It's a common deficiency with LEDs and is necessary to form green. A subtle thinning of the leaf tips with a tendency to turn to the side is a good sign of this. Not twisting, they remain flat and healthy looking, but are not totally straight. Having the last 20mm veering off to the side just 10 degrees perhaps. Its the best sign to look for as nothing else does it.

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            #7
            Def think its variant dependent too. My Nice Chunk looked a bit stressed, the first cut of her performed way better. 2 Skunks looked stressed but the Skywalker was fine. Same tent, germ times and nutes.
            Running 2xSP250's in a 4x4 veg. Had to lift them to 1m of the canopy, the girls love it.

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              #8
              There is no doubt it's strain dependent and that they can become accustomed to it over time.

              It won't be long until we are buying seeds from breeders that work under LED's and as such produce the goods we need. Making HID growers do the moaning

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                #9
                IMO this is probably simple light shock. With LED's it can be difficult to judge the brightness on the canopy without a PAR meter. Most LED's provide far more blue & red wavelengths than HID. The brightness may look similar to your eyes but the plants are getting blasted.

                I would allow 2-3 weeks for plants to get accustomed to the more intense LED light. Start with the light WAY far away or dim it way down. If 3 feet isn't working try 4 or 5 feet. Then increase the brightness on the canopy every few days until you're up to full power. The pro LED fixtures I was using needed the plants to start 55-60" inches away - 5 feet - but after a few weeks the tips of the plants could grow within 15 inches no problem. These were only 320 watt fixtures.
                OG refugee

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                  #10
                  I think if your plants get stressed under leds it's because they are not getting their other demands met. High light levels require other limiting factors to be met and it isn't as easy as with lower intensity. It may be that the plant's root system is not large enough or the feed isn't optimal.

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                    #11
                    So I increased the temps to 85 and dimmed them to 20% and like clockwork they are starting to recover. I put the lights at 40% today and they drooped again. So my conclusion is the light is much more efficient that HIDs.

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                      #12
                      yes, you need all your ducks in a row to get your plants to handle modern LEDs, especially in veg.

                      Temps, soil temp, not rootbound, extra cal/mag, etc.
                      My contributions to this website in no way imply support for any political or cultural views promoted here.
                      -----
                      To the large and singular furniture of this noble island i have added from foreign places all the variety of herbs and flowers that i might any way obtain. I've laboured with the soil to make it fit for plants, and with the plants that they might delight in the soil - so they might live and prosper under our climate as in their native and proper country.
                      Gerard's Herbal (1636)

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                        #13
                        I think I'm kidding myself that I can put 600w inches above a meter. Any petiole the light touches is sprayed red, while the tops of buds can refuse to go any higher. I can combat the red with crazy amounts of Mg but then I get Mg patterns on the lower leaves that are hard grainy brown. I can't balance it.

                        In fairness I come from GreenPower son's at 1.7umol/j that would of put maybe 1.5umol/j down on a good day(shade and age losses). The 301H is talking 3umol/j so 400w is a third more. I'm trying for double. It was never a great idea. Though a 450w run did come in 25% under target so I'm reluctant to try that again. Though I recognise I'm doing this wrong.

                        450w has always seemed perky. An improvement over 400w that can be seen in a day. Beyond 450 I can't say I have seen any improvement at all. Keeping in mind it's not 18" up, it's more like 8 but spread


                        My lights are the R-spec blend and the sodiums were top notch in award winning shades (50p shades. Pro ultra something. 8 sides..)

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                          #14
                          Originally posted by RedBeardy5 View Post
                          So I increased the temps to 85 and dimmed them to 20% and like clockwork they are starting to recover. I put the lights at 40% today and they drooped again. So my conclusion is the light is much more efficient that HIDs.
                          that is a good news
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                            #15
                            Didn't realize led can be so fickle, sucks
                            to hear this!

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