Thread: Plastic, glass, and light absorption
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Old 31-03-2003, 07:44 PM
simy1
 
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Default Plastic, glass, and light absorption
(Mark) wrote in message om...
Does anyone have a good source for the wavelengths of light
absorbed/blocked by various clear plastics/glasses, and what impact,
if any, this has on growing plants. From the dim recesses of my mind,
I seem to remember that chlorophyll works best with (?) 420 nm or
something like that...

...The reason I'm wondering is because I want to know if I can build a
small greenhouse/cold frame from just any old transparent panels, or
if some will deny the growing plants the right "kind" of light.

Thanks,
Mark

420 nm is green light (somewhat bluer than normal green). All those
materials cut off in the UV. As long as they are trasnparent, no
problem. There is a lot more attenuation in the atmosphere (proof
being that the sun looks yellow to us, but yellow-green to the
Shuttle's inhabitants).
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