stupid question about LED light, but I need clarity here. PLZ

erngzerngz

Active Member
Hi, I just got 450W LED. It is 3watt each.
Whats the distance between the light and the canopy?
My plants are veg for about 3 weeks and I'm flipping the light to 12/12 with the new LED.
I've read from many LED growers. some say 450W should be hung at 30-36 inches from the top of the canopy.
some say 16-20inches. other say 6-10inches while flowering.
Well, I'm confused. I use scrog method and I wanna make sure I get the right distance from the light to the screen.

Every comments is appreciated
 

PetFlora

Well-Known Member
First most LED manufacturers mislead (LIE) about wattage. You could have as little as 250 actual led w (or less)

Lens angles also play a roll in distance; 90* lenses need to be much farther away than 120*

You canget a rough idea how far by setting the light an either using a sheet of paper and moving it up/down until you see a fall off of intenssity

IMO you want to acclimate your plants to the new light prior to flipping
 

FranJan

Well-Known Member
Hi, I just got 450W LED. It is 3watt each.
Whats the distance between the light and the canopy?
My plants are veg for about 3 weeks and I'm flipping the light to 12/12 with the new LED.
I've read from many LED growers. some say 450W should be hung at 30-36 inches from the top of the canopy.
some say 16-20inches. other say 6-10inches while flowering.
Well, I'm confused. I use scrog method and I wanna make sure I get the right distance from the light to the screen.

Every comments is appreciated
Hey Ern. That's the problem owning panels most people don't have, questions like this arise. My own rule of thumb is to find the coverage that you want, (within reason :) and probably less than the manufacturer's recommendation), then see if the plant stretches or not. If it stretches, drop the panel till the node space is acceptable to you. If it's not stretching, leave the panel alone or raise it to increase footprint. The combination of panels and strains is unique, so it's up to you to monitor the behavior of the plant and see if the environment is what the plant wants/needs. Good Luck and Happy Growing.
 

erngzerngz

Active Member
Thanks guys, I guess I have to learn it by my experience. I'm putting it 20 inches over the scrog screen, waiting to see what happen
 

mamakush

Active Member
18 inches is my happy place. My lights have a 120 degrees lens angle (according to company reps) and I've found 18 inches to be the best combo of penetration and footprint. For what it's worth, I do this with a 750 watt panel...
 
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