Plants wilting after LED installed

Hey guys,

I just switched from a 600w MH (veg) to a HLG 550 v2 rspec. First time using such a powerful LED i currently have it hung 30” from plant tops and dimmed to 50% to try and ease them in.

Some backround info:

Medium: pro mix hp
nutes: flora series and floralisous +
light cycle : 18/6
Temp: 22• C
RH: 50%
strains: lemon skunk, Skittlez cake, triple og, northernlights x skunk, Candy Store R1

candy store is the one with the wierd orange markings. Pics are with flash but lights off. Cant seem to get them to bounce back its been 5 days since i switched the light.

your help is very appreciated thank you.

Forgot your pics

Sorry these are the pics almost forgot lol

Do you have a way to raise your temp? They kinda look cold. Have you been watering less since the switch to led?

Those plants look sick prior to the new light being hung.

Wait for someone more experienced than me with Cannabis, but I went from outside to under LED and had significant problems like you to start. I was underwatering and it looks like to me that you just like me are in severe need of some Calcium and Magnesium. As I understand it a very common deficiency under LED.

Purple stems are magnesium deficiency, spots on leaves is a calcium deficiency

what are you phing your feed to?

Grab yourself a bottle of calimagic and add that to your feed schedule as well.

IrkinBollikans said:

Do you have a way to raise your temp? They kinda look cold. Have you been watering less since the switch to led?

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iv been watering as they get dry i noticed theybare getting dry slower though

Looks like root issues not lighting issues. Did you recently transplant? Overwatering? 22c is cold why are u running them at 72f?

bk78 said:

Those plants look sick prior to the new light being hung.

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i have attached a picture of their last day under the MH for reference. They look a lot better then but maybe you can see something i dont? Too bad i only have a pic under the mh and not at dark.

ph is 6.2-6.4

also im using 2ml calimagic per gal feed

p0opstlnksal0t said:

Looks like root issues not lighting issues. Did you recently transplant? Overwatering? 22c is cold why are u running them at 72f?

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nope no transplant in the last month or so. Unless they're root bound in the 5gals? This is my First grow from clone and they been veging for about 2 months.
what is the ideal temp to run these at? I plan on making adjustments to the temps

budsfordayz said:

i have attached a picture of their last day under the MH for reference. They look a lot better then but maybe you can see something i dont? Too bad i only have a pic under the mh and not at dark.

ph is 6.2-6.4

also im using 2ml calimagic per gal feed

Click to expand...

When running led you want your leaf surface temps at 28-30 Celsius at around 60%rh. Get your temps and humidity up and youll see a change

budsfordayz said:

nope no transplant in the last month or so. Unless they're root bound in the 5gals? This is my First grow from clone and they been veging for about 2 months.
what is the ideal temp to run these at? I plan on making adjustments to the temps

Click to expand...

what was the temp and RH in the room before LED?

look up VPD its possible those girls cant breathe in that room.

p0opstlnksal0t said:

what was the temp and RH in the room before LED?

look up VPD its possible those girls cant breathe in that room.

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the mh ran alot hotter so inwas at 25-27 and closer to 60% rh. I know your right because the plant that took the most damage is Candy Store r1 by ethos and its known for being extremely sensitive to VPD.

i need to play around with the fan settings tonight try to keep more heat/ humidity in the tent .

bk78 said:

When running led you want your leaf surface temps at 28-30 Celsius at around 60%rh. Get your temps and humidity up and youll see a change

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awesome thankyou for this im going to adjust the exhaust tonight if that doesn't work ill just move the whole tent from the basement.
Im so used to having too much heat with the HPS/mh and now i have too little lol.

budsfordayz said:

awesome thankyou for this im going to adjust the exhaust tonight if that doesn't work ill just move the whole tent from the basement.
Im so used to having too much heat with the HPS/mh and now i have too little lol.

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Bro, Im the same way,I couldnt get the temp upto 84,.. it stays around 77-78

Hands On said:

Bro, Im the same way,I couldnt get the temp upto 84,.. it stays around 77-78

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your plants were wilting too? Im glad its not something more severe tbh im usually pretty good at finding creative ways too raise/lower heat/humidity. I should have known changing the light would require a full environment change.

I didnt have any wilting,...just low heat

Shut off the exhaust and put circulating fans in . Temp has been sitting steady at 28 c and 63% humidity. Gunna monitor it Tomorrow hopefully this will last until the inkbird comes in. Thanks for the help everyone!