LED distance Guide

BurntByFire

BurntByFire

Active Member
Wattage and Distance: How Far Should Your LED Grow Lights Be From Your Plants?
  • 200 Watts – 12-20 inches during the vegetative phase, 8-16 inches during bloom phase
  • 400 Watts – 20-27 inches during the vegetative phase, 13-21 inches during bloom phase
  • 600 Watts – 30-38 inches during the vegetative phase, 18-30 inches during bloom phase
  • 800 Watts – 32-42 inches during the vegetative phase, 19-34 inches during bloom phase
  • 1000 Watts – 36-46 inches during the vegetative phase, 21-36 inches during bloom phase
 
BurntByFire

BurntByFire

Active Member
Rocket Soul said:
This is not very accurate, hanging height depends on form factor, optics and the area you want ro cover.
Click to expand...
True but for someone just starting out (noobs) it’s a great starting point.

like telling a new driver where the gas pedal, brake pedal etc is.

how hard to press the gas and brake etc vary by car and come with experience.
 
BurntByFire

BurntByFire

Active Member
Boatguy said:
I think you are missing what @Rocket Soul is trying to say.
Size of the fixture, and the footprint have more to do with hanging height than wattage
Click to expand...
I do understand exactly.

I’ve checked the LED lighting section and to be honest there is absolutely nothing there.

send me a rollitup.org thread that explains your above points and gives guidance to a noob or someone who wants to switch from MH/HPS to LED...

most don’t have a PAR meter or won’t go out and buy one. Ask someone new what’s their form factor or optics on their LED and you’ll get a deer starring into headlights.

Everything I have read basically says pick a distance usually 24” and see if bleaching starts then adjust. That’s not really good advice.
There’s gotta be something out here that has some general guidelines
 
Boatguy

Boatguy

Well-Known Member
The basic guideline is 50w per square foot for hid, 35w per square for led. Obviously a single cob run at 150w would need to be kept farther away than a qb, or strip fixture.
 
BurntByFire

BurntByFire

Active Member
Boatguy said:
The basic guideline is 50w per square foot for hid, 35w per square for led. Obviously a single cob run at 150w would need to be kept farther away than a qb, or strip fixture.
Click to expand...
Yes so for my 5x9 gorilla tent = 45 sqft = 1575watts

so I go out and buy two LED lights with these specs (as an example)

720 watts per light
Medical Plant Light 10 strips, 640W, 3500K add 660nm, plus 2X 40W ( UV +IR) , 47X42X4.5inch,120V, Dimming for single fixture, RJ14 adaptor, total 720W, 2.6 μmol/J.
1872umol/s

***During veg period***

Run at 100% for 48”
Or
60% for 24”
Or
Just run 24” at 100% power

use the UVIR option?
Turn it off

Your advice helps me decide which light to buy but not how to effectively use it or a starting point to work from.
 
Just Be

Just Be

Well-Known Member
A lot of noobs go for the lower priced LEDs off of Amazon. These distances suggested by Mars Hydro are pretty standard among the other 'top tier lower budget' LED sellers.
Mars Hydro TS 600 (and general low budget LED) distances.jpg
 
1

1212ham

Well-Known Member
BurntByFire said:
I do understand exactly.

I’ve checked the LED lighting section and to be honest there is absolutely nothing there.

send me a rollitup.org thread that explains your above points and gives guidance to a noob or someone who wants to switch from MH/HPS to LED...
Click to expand...

There absolutely is very good info here! This is just a tiny sample.

Slow yellowish growth under vero 29 3000k/3500k

https://imgur.com/a/uLLbG Updated pics, lights on and off with camera flash. Turned down the lights to 200 watts total and they are 22" above the canopy... I wanna say the clone looks slightly better (back right) but the one on the back left is still pretty light colored with some curling...
www.rollitup.org

How can I tell how much light my plants are getting from an led

Without spending over $500 or burning the shit out of them. I would like to hang my led as low as possible and run it as dimmed as possible but still get good results. Is there any way to measure light from an led that is affordable and actually reliable?
www.rollitup.org
 
cobshopgrow

cobshopgrow

Well-Known Member
thats pretty vague information still, not much help for many.

question should be more like
ppfd (per watt), spread of leds, used area, what should be the distance to the plant?
 
salmonetin

salmonetin

Well-Known Member
Rocket Soul said:
This is not very accurate, hanging height depends on form factor, optics and the area you want ro cover.
Click to expand...
Boatguy said:
I think you are missing what @Rocket Soul is trying to say.
Size of the fixture, and the footprint have more to do with hanging height than wattage
Click to expand...
cobshopgrow said:
thats pretty vague information still, not much help for many.

question should be more like
ppfd (per watt), spread of leds, used area, what should be the distance to the plant?
Click to expand...
hanging height depends on ...ppfd (per watt) ....form factor (Size of the fixture, and the footprint), optics (spread of leds) and the area you want ro cover (used area)... i will add ....and the reflective walls (incluyendo suelo y techo) y temperaturas de la canopia (plant canopy temps) y del used area (temps ambient ...zone ventilation or ... climatization used..,,,,and....)...;)

por tu like bro C anulo la e function...;) y edito añadiendo algo mas...

SI Wilson...creo que el bro RS y otros bros le querian decir a el que hay muchas cosas a valorar para poder generalizar...a el por lo que veo le cuesta dar al like... :wall:

paz

Saludos
 
Last edited:
M

Meast21

Well-Known Member
BurntByFire said:
Wattage and Distance: How Far Should Your LED Grow Lights Be From Your Plants?
  • 200 Watts – 12-20 inches during the vegetative phase, 8-16 inches during bloom phase
  • 400 Watts – 20-27 inches during the vegetative phase, 13-21 inches during bloom phase
  • 600 Watts – 30-38 inches during the vegetative phase, 18-30 inches during bloom phase
  • 800 Watts – 32-42 inches during the vegetative phase, 19-34 inches during bloom phase
  • 1000 Watts – 36-46 inches during the vegetative phase, 21-36 inches during bloom phase
Click to expand...
Is this the actually wattage the led uses or the hps lighting equivilant??
 
Rocket Soul

Rocket Soul

Well-Known Member
Meast21 said:
Is this the actually wattage the led uses or the hps lighting equivilant??
Click to expand...
It's not really usefull info. 600w from a light where the total area that emits light is 3x2 feet ( for example) can be hung much closer than a cob light of 600w which has an emitting area of a few square inches.

In the same sense: does 2 x600w HPS need to be hung at the same distance as one 1200de HPS? No, cause they spread the light in a different way. Check the links above and mfer recommendations or link your light for help.
By the way in 99.999% cases of modern posting here it's actual power draw, non of this equivalency bogus, or potenial max output of diodes. Just wall draw.
 
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