polishpollack
Well-Known Member
Jack's works because it's got most or all of what plants need. It's also kind of a hot fert as fertilizers with a crystal structure tend to be stronger than granular powder types or the liquids.
HELP! What is going on with these plants?
- Thread starter KanaGirl
- Start date
KanaGirl
Member
I have mine about 30" away right now, but I have it on lowest power. I increase power gradually thru-out the grow.
RetiredToker76
Well-Known Member
I've had similar issues with every crop I've grown since I switched to an LED. Different nute schedules, different soils, and even different strains, and it undoubtedly is coming down to how focused my lights are. With my old HID, it was pretty obvious when things were too hot before the leaf actually started to show any burn. The LED's seem to have a sweet spot that once the plants grow beyond it you'll find what I've started to call "burn bars" in the leaves. Depending on intensity I've had them be bleached spots or full on blackened burn spots.
One afternoon I did some minor trimming and rotated the plant maybe two or three inches. The next day I had a "streak" across the top leaf that looked like a laser gun burn in a sci-fi movie. After 4 cycles with these new lights that have had wildly ranging yields on a strain I've grown for years, I'm starting to resign to the fact I'll probably just have to bite and either rent or buy a good quantum PAR sensor.
HID's were easier, albeit less efficient, IMO. I had it set to the ideal distance and I was done. With the LED I can adjust the intensity but there's no internal mechanism that allows for data specific dialing; and our eyes are HORRIBLE light sensors.
I'm not familiar with your specific brand of LED or what they offer on the back end for support, but HLG recently put up a PPFD calculator for using a cell phone to determine your photon flux. I don't trust my cell phone to give me good numbers for the calculator, but at least it's a data-point of some kind. After dropping over a grand into the grow this year, I'm really hesitant to spend another $300 - $500 for something that I'm pretty sure once I have set point I won't have to worry about again for years. There are a few online rental places that offer them, most are tuned specifically for underwater reef applications, but I found a couple they unfortunately require a $300+ deposite for the rental. :-/
I'm in the LED burn category because it looks exactly like what I'm getting.
One afternoon I did some minor trimming and rotated the plant maybe two or three inches. The next day I had a "streak" across the top leaf that looked like a laser gun burn in a sci-fi movie. After 4 cycles with these new lights that have had wildly ranging yields on a strain I've grown for years, I'm starting to resign to the fact I'll probably just have to bite and either rent or buy a good quantum PAR sensor.
HID's were easier, albeit less efficient, IMO. I had it set to the ideal distance and I was done. With the LED I can adjust the intensity but there's no internal mechanism that allows for data specific dialing; and our eyes are HORRIBLE light sensors.
I'm not familiar with your specific brand of LED or what they offer on the back end for support, but HLG recently put up a PPFD calculator for using a cell phone to determine your photon flux. I don't trust my cell phone to give me good numbers for the calculator, but at least it's a data-point of some kind. After dropping over a grand into the grow this year, I'm really hesitant to spend another $300 - $500 for something that I'm pretty sure once I have set point I won't have to worry about again for years. There are a few online rental places that offer them, most are tuned specifically for underwater reef applications, but I found a couple they unfortunately require a $300+ deposite for the rental. :-/
I'm in the LED burn category because it looks exactly like what I'm getting.
KanaGirl
Member
That's interesting. I've already done a grow with this light, and had no issues. However, this time I blasted them on accident because I turned the light up to see what I was doing with the pruning/training for the mainline, and then forgot to turn it back down. The light was way too close and too high for these 4 week old plants.
I appreciate you chiming in though, because it confirms my thoughts that it was the light causing the leaf issues. I am definitely going to be careful with the light height and intensity from here on out
