Why does raising my light make plants taller?

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ComfortablyNumb

ComfortablyNumb

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Newbies hear it all the time, if you want taller plants, raise the light, or dim it. Why?
Light Intensity. Light is made of photons. Photons all have the same amount of energy.
The farther away the light is, the more it spreads out. The more spread out, the less intensity.

Your plants have an intensity that they really like. When you are below that level, they grow taller to get more intense light.
When you are above that level, they slow way down so they don't grow out of the plants favorite intensity zone.
When you are way above that level, the plants begin to burn and suffer.
When you are way below that level, the plant will almost stall and grow just enough to stay alive.

What is that magic intensity level for my plants?!
Nobody knows yet. I'm sure there is ongoing research on this because if you know the number you can have your plants on the bleeding edge safely all the time. Dr. Bruce says it can change depending on how much you feed or water.
The number is likely species dependent with strain variations.

So, if you want taller plants, lower the intensity.
Shorter plants, raise the intensity.
Your dimmer switch changes the amount of photons.
 
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quirk

quirk

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It is indeed species specific and has been studied extensively. See Cannabis Sativa
 
ComfortablyNumb

ComfortablyNumb

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Very nice. Do you have a chart with the various species? Sativa, Indica, Ruderalis? We might be able to infer the perfect number from that.
 
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