Light distance question

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cbuts05

Well-Known Member
Hey guys, I always adjust my lights according to temperature at the top of my plants, usually 10-20" away two 1ks.
What I'm wondering is when I'm looking online, I can ALOT of grows where the lights are nowhere near the plants, like way up..what is the reasoning for this ?

Thanks
 
newbuddy

newbuddy

Well-Known Member
I keep my lights right on the plants so they dont stretch but when they flower, move em away some so they dont get too hot
Hope that helps-Im green as a pool table doing thig!
 
k double

k double

Well-Known Member
cbuts05 said:
Hey guys, I always adjust my lights according to temperature at the top of my plants, usually 10-20" away two 1ks.
What I'm wondering is when I'm looking online, I can ALOT of grows where the lights are nowhere near the plants, like way up..what is the reasoning for this ?

Thanks
Click to expand...
I've seen lights as you described plenty of times... People are just utilizing the foot print of the light... where as long as the plant remains in the optimum range (distance) from the light.
 
C

cbuts05

Well-Known Member
k double said:
I've seen lights as you described plenty of times... People are just utilizing the foot print of the light... where as long as the plant remains in the optimum range (distance) from the light.
Click to expand...
Oh I see..I just thought it would be too far.like those warehouse grows where the lights are way up lol
 
A

az2000

Well-Known Member
cbuts05 said:
I can ALOT of grows where the lights are nowhere near the plants, like way up..what is the reasoning for this?
Click to expand...
It depends upon the intensity, the focus of the light. For example, I have LEDs with 5w diodes mounted in reflectors (and, maybe secondary lenses). I have to keep them higher. I have a UFO with 3w diodes mounted on a white backboard (diffuse light) and it can be 2" in from a leaf.

This light meter app for Android has a calibration feature. You could use that to see how strong your light is. Lumens/Lux isn't too accurate for grow lights. But, if it's all you have... You can also spend $25 (US) on Amazon for a Dr. Meter lux meter. The sensor would probably be better than your smartphone.
 
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