What light do plants need? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 11-24-2003, 02:29 PM Thread Starter
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Hi,

Can anyone point me to research results regarding what light do plants need?

After reading tons of stuff on the internet for 2 months now - I am at ground 0....

Many are saying that plants need blue and red. Some are saying that they can use whatever color they get. Some are saying that there's more to sun light than photosynthesys. Some are saying that the fact that most leaves are green is proving that plants "return" the color of light that they don't use. Others are saying that red plants need blue... Some are recommending to use special "narrow" spectrum bulbs while others are saying that this is absolutely not needed. Many are saying that blue makes the plants taller while red makes them more bushy....

Anyway - I am confused.....

Now - I need a scientific research(es) in order to calm down...

Thanks,

Aviel.
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post #2 of 4 (permalink) Old 11-24-2003, 02:42 PM
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They need intensity and duration, if you get full spectrum bulbs you won't have to worry about anything other than enough, watts per gallon is USUALLY a reasonable measure, and how long. Tropical plants need about 10 hours, plants from more temperate climes need up to 14. We usually go with the 10 to 12 hours range to cover most of the plant we mix in our tanks.

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post #3 of 4 (permalink) Old 11-24-2003, 02:48 PM
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Quote:
Originally Posted by aviel
Many are saying that blue makes the plants taller while red makes them more bushy...
I believe its the other way around. I just added some bluish-white looking bulbs to my tank, and the internodes of plants are getting considerably shorter, while more sideshoots develop, especially on Rotala and Ambulia.
Part of it could be the higher intensity as well.

No scientific research though :cry:


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