LED light 12 inches above canopy during flower?

[CTgrower420]

Currently running my LED grow lights Spider Farmer SE5000 about 12” above the canopy of the tallest plants in my grow turned up pretty much to the max power 620PPFD-1100PPFD is what I’m getting throughout my canopy’s from lowest to tallest plant is this a safe distance? The lights can’t be raised any higher reached max height!

 

[cannabiscrusader]

12" at max is too much. You are going to roast your nuggets.

 

[pegboy]

Your borderline for those top buds but if the plants don't mind let her rip. But keep a close eye on those top buds.

 

[CTgrower420]

Your borderline for those top buds but if the plants don't mind let her rip. But keep a close eye on those top buds.

How can you tell if they’re burning?

 

[CTgrower420]

raised the light past full height the big tops are at 13” now from the light that’s the best it’s getting

 

[cannabiscrusader]

The leaf edges at the tops will begin to discolor. If you don't dim the lights at that point, water will continue to transpire from the leaf faster than the nutrients can be used. This leads to a buildup of nutrients that begin to burn the leaves.

 

[Cousin Bo]

raised the light past full height the big tops are at 13” now from the light that’s the best it’s getting

Do you know the LUX reading? I have a couple plants that are about that close now and they seem happy even though some spots are getting close to 100,000 LUX.

 

[CTgrower420]

The leaf edges at the tops will begin to discolor. If you don't dim the lights at that point, water will continue to transpire from the leaf faster than the nutrients can be used. This leads to a buildup of nutrients that begin to burn the leaves.

Raised it to highest it possibly can get 13” above tallest colas 22” above shortest colas

 

[CTgrower420]

Do you know the LUX reading? I have a couple plants that are about that close now and they seem happy even though some spots are getting close to 100,000 LUX.

Not sure about LUX but I think the tallest plants are in the 1000-11000PPFD

 

[Cousin Bo]

Not sure about LUX but I think the tallest plants are in the 1000-11000PPFD

They look like they're handling it fine now.

 

[CTgrower420]

They look like they're handling it fine now.

 

[cannabiscrusader]

They look like they're handling it fine now.

Everything is always fine, until it isn't. Those colas 22" away should be just dandy. Super crop or lay down some of the big ones if they begin to show light stress signs.

 

[CTgrower420]

Everything is always fine, until it isn't. Those colas 22" away should be just dandy. Super crop or lay down some of the big ones if they begin to show light stress signs.

The ones 13” below the light have been bent down past the limit now they are budding can’t do anymore low stress training on them

 

[cannabiscrusader]

The ones 13” below the light have been bent down past the limit now they are budding can’t do anymore low stress training on them

You've done everything you can then, aside from boosting the tent. Good on you being proactive

 

[Moflow]

turned up pretty much to the max power

Just turn the power down to 80%, sorted!

 

[coreywebster]

Going against popular opinion, I'd say its fine because it's a bar light your not getting massive hotshots.

Mine are about 6" off the tops I think.

Personally though I'd bend all those plant gently out and tuck them.. lots of wasted space in that net and you can fill it by pulling them tops one way or another

 

[cannabiscrusader]

BTW, that's the most math I've done since my apprenticeship almost 20 years ago. Don't judge me

 

[CTgrower420]

Going against popular opinion, I'd say its fine because it's a bar light your not getting massive hotshots.

Mine are about 6" off the tops I think.

Personally though I'd bend all those plant gently out and tuck them.. lots of wasted space in that net and you can fill it by pulling them tops one way or another

Next grow I’ll be filling fully this was my first grow using trellis nets
They been doing ok at 13” above canopy even at max power because the grow light is only 480w max
If have to add another net to bend the tall ones but they are budding already so I’ll just have to wait till next run

 

[1212ham]

I have a bar light in one of my tents too, a KS5000. That thing will still slowly roast a canopy at %50 if it's any closer than 16". Everyone's set up is different too, not just environment. I'm an electrician, and I've seen some home panels running at 126v some at 116v. That makes a huge difference in your led output. Using olm's law you can see it with the numbers.

Amps = voltage ÷ resistance
I = E/R

Well say a bar is 10ohms

I = 116v / 10
I = 11.6 amps

I = 126v / 10
I = 12.6 amps

That's an extreme variation, but something to consider. 1 amp is a big difference when we are talking about inches of light placement.

It doesn't work that way, LEDs don't connect directly to AC power, they are powered by drivers that regulate voltage and current.

Most Meanwell drivers are rated to operate on 90-305 volts AC, but the diodes get the same power.

 

[cannabiscrusader]

Told ya it was 20 years ago. Math is fun