Unhappy plants after switch from cmh to led

H

Harry_potter

Member
Hello I currently have a veg room full of 4 x 315 cmh lights for vegging. Soon as they get big enough I put them in my flower room under 8 x 500w leds, that's when they go weird. They seem to stop stretching and they just grow alot of new nodes they sort of stay mini and don't grow also they sometimes turn abit yellowish, and abit droopy and the fan leaves don't grow . This happends everytime I change from veg to flower rooms.

Can anybody help?
 
It's quite possibly the high bay leds being 6000K- 6500K that are keeping the plants short and squat.
There's a ton of blue light and not enough red for flowering.
Look at pictures below.
You need 2700K - 3500K for flowering. Notice the blue peak. A lot of red compared to the blue
Ì use 4000K for vegging and it keeps the plants short n squat.
fd01c0c1f295184abbf3370a43524642769015ca.png

Some use the below spectrum as a finishing light at the end of flowering.
20210217_113534.png
You'd be better off using the CMH 315 for flowering as it has the better all round spectrum
315W_3K_1000x.png
315W_3K_1000x.png
 
cobshopgrow said:
these Ufos do look a bit strange specs wise, dont they?

500W Watt UFO LED High Bay Light Warehouse Led Factory Shed Fixture Highbay Lamp | Industrial Lighting

industrial-lighting.org
500W on less then 300 mid power leds?, sry, too lazy to count but cant be much more.
Click to expand...


Couple of things.

Number one, as everyone else said, that light is simply the wrong spectrum for trying to flower plants. That's for humans to see things which is much different.

Number two, I don't see a driver external to that light. That means it's probably one of those direct A/C driven LEDs which means that you lose half the efficiency on the power cycling as opposed to a direct current driven one. Also means you're getting too much heat. I would not suggest using the direct AC driven LEDs.
 
At one stage I was vegging with the 315s then I swapt them for the leds and it still happend. And it was in veg the whole time so its happening even when its not in flower. The main issue is when its in veg and I swap the light it becomes unhappy
 
testtime said:
Couple of things.

Number one, as everyone else said, that light is simply the wrong spectrum for trying to flower plants. That's for humans to see things which is much different.

Number two, I don't see a driver external to that light. That means it's probably one of those direct A/C driven LEDs which means that you lose half the efficiency on the power cycling as opposed to a direct current driven one. Also means you're getting too much heat. I would not suggest using the direct AC driven LEDs.
Click to expand...

6500k isnt ideal to flower, while it still can grow you healthy plants, it doesnt explains the yellowing nor the unhappiness to me.

Mo is for sure right, they stay smaller under this much blue light in the spectrum but thats may not your problem here?
its hard to get a picture of what your light put out in real.

do you measured the wall draw? they draw 500W
would be good to be be able to compare the intensity to the CMH, getting the picture how intense or not intense your light is.

the UFO light do probably use a very shitty driver concept beeing not very efficient, and emitting more heat then needed
still the AC will be converted to DC by a bridge rectifier, it wont be half the efficency even driven with AC directly as the LED would just light up half of the time then, remember its a diode.
using a real driver is always better, but likely not part of the problem here.
 
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