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How close to put LED to plants?

  • Thread starter Thread starter irishboiii
  • Start date Start date Jun 6, 2014
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How close to put LED to plants?

irishboiii Jun 6, 2014 46 Replies 108,968 Views
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Ecompost

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#21
OldManRiver said:
I have a cheapo Higrow 300W panel from amazon, and it is awesome for seedlings to ten inches. $89. No stretch, no burn, veg setting only.
Click to expand...
nice, you shouldnt need to spend a lot on a seed light. A common CFL works also, as does the windowsill :-)
 
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dnewsome2

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#22
The manufacturer has done very extensive research on that light before they sold it to you. Go off of their recommendations. Move the light in 2 inch intervals. Wait to see the results over several days..
 
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Newtogrowing

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#23
Ecompost said:
​
likely 24-36 mate
Click to expand...
Much appreciated!!! I have it at about 18-20 inches now, so raise it up a couple? I have fans on them and the room temp is 77 degrees.
 
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dnewsome2

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#24
Newtogrowing said:
Much appreciated!!! I have it at about 18-20 inches now, so raise it up a couple? I have fans on them and the room temp is 77 degrees.
Click to expand...
Your light recommends that you have the light at 24 inches to be able to cover a 3 by 3 evenly any closer and your area will shrink. For a Seedling it would be more like 30 inches away. To be honest your seedling would be a lot happier with just a 25 watt CFL in 6500k plus you wouldn't be burning a bunch of unnecessary Electric. You could probably get that plant 6 or 8 inches tall on one little CFL keeping it 6 inches away.
 
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dnewsome2

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#25
You can get a pack of 4 for under $10 LOLhttp://www.homedepot.com/p/Philips-100W-Equivalent-Daylight-Deluxe-T2-Twister-CFL-Light-Bulb-4-Pack-E-433557/204855102?keyword=6500+K+CFL&searchtype=text
 
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Newtogrowing

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#26
dnewsome2 said:
Your light recommends that you have the light at 24 inches to be able to cover a 3 by 3 evenly any closer and your area will shrink. For a Seedling it would be more like 30 inches away. To be honest your seedling would be a lot happier with just a 25 watt CFL in 6500k plus you wouldn't be burning a bunch of unnecessary Electric. You could probably get that plant 6 or 8 inches tall on one little CFL keeping it 6 inches away.
Click to expand...
I always start off my plants with 4 6500k cfl's and had no problem with them growing. I grow 2 plants at a time because of space. It seems to work well.
 
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Ecompost

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#27
Newtogrowing said:
Much appreciated!!! I have it at about 18-20 inches now, so raise it up a couple? I have fans on them and the room temp is 77 degrees.
Click to expand...
canopy and root temps are critical, UV radiation passes through air and so dont show on standard room temp gauges.. leaves will be hotter than the air by nature of UV. Try to get a laser temp thing, this will allow you to consider the warming effects of UV.

look at Vapor Pressure Deficit and understand how changing one variable means you must adjust others
 
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Harley09

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#28
I have 5 w LED's and I start my seeds under them at 16" away and I get very little stretch
 

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indicabush

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#29
Some stretch is not a bad thing depending on what your growing.

"·Core Coverage at 24" Height 2x2ft"
"Max Coverage at 24" Height 3x3ft"

from Amazon the above specs...so everything is at 24"...hmmm
 
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EmilyTaylor

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#30
Since your grow light is a high wattage LED, it needs to be hang about 30'' above the plant. If my memories don't fool me then there's always information on how far you should keep the light away from the plant written on the product. Maybe you should check it for the best answer.
 
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Newtogrowing

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#31
EmilyTaylor said:
Since your grow light is a high wattage LED, it needs to be hang about 30'' above the plant. If my memories don't fool me then there's always information on how far you should keep the light away from the plant written on the product. Maybe you should check it for the best answer.
Click to expand...
Your right!!! I just checked and its 24-26" above the tops. In flowering its 18". Thanks for the reply. Peace Out..
 
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dan1989

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#32
I've had mine a lot closer than 18 inches with no problems. Every unnecessary inch further away is less light for your plants. Experiment, your plants will tell you if you're too close before any irreversible damage is done. Of course, too close and you're not getting the coverage. The last thing you want to do is follow manufacturers guides on anything. Nobody has told your plants about those guidelines, they don't follow set rules, every plant is different.
 
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sixstring

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#33
i ran my mars 1600 about 12 to 16 inches up,i run my cobs 10 to 12 inches up now
 
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The Dawg

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#34
Oh Snap Did I Hear Ah But I Did Did ;)

/www.youtube.com/watch?v=danS7JIIZ0Y
 
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Newtogrowing

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#35
dan1989 said:
I've had mine a lot closer than 18 inches with no problems. Every unnecessary inch further away is less light for your plants. Experiment, your plants will tell you if you're too close before any irreversible damage is done. Of course, too close and you're not getting the coverage. The last thing you want to do is follow manufacturers guides on anything. Nobody has told your plants about those guidelines, they don't follow set rules, every plant is different.
Click to expand...
I agree!!!
 
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Newtogrowing

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#36
sixstring said:
i ran my mars 1600 about 12 to 16 inches up,i run my cobs 10 to 12 inches up now
Click to expand...
I don't care for the cobbs. I used it twice and my plants grew like skinny bean poles. lolol
 
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The Dawg

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#37
Nuttin But Bushes Under My Cobs :smoking:

 
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The Dawg

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#38
Here's A Couple Of Clones From The Above Plant. I'm Currently Running My 2nd 80 Vs 90 Cri Grow To See If I Can Duplicate The Results Of The 1st Grow :party1:

 
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Newtogrowing

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#39
The Dawg said:
Here's A Couple Of Clones From The Above Plant. I'm Currently Running My 2nd 80 Vs 90 Cri Grow To See If I Can Duplicate The Results Of The 1st Grow :party1:

View attachment 748411 View attachment 748412 View attachment 748413 View attachment 748414
Click to expand...
Thats some healthy plants!!!! lol, Sweet
 
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BioStimz

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#40
It all depends on the unit's heat output.

At full-draw [800 watts] my SolarSystem puts out 2500 BTUs. Average HPS setups run at about 3400 BTUs. Manufacturer recommends 24-inches from the tops.

~
 
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Replies 46
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Started Jun 6, 2014
Latest post Jan 15, 2020
Starter irishboiii
Forum L.E.D Grow Lights

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