Far-red light box

Mark Spiro spiro at bucknell.edu
Thu Aug 17 11:27:07 EST 2000

Is it actually the water or the microorganisms in the lake that absorb the 
red light?  We have used water in a casserole dish for cooling red-light 
with good success. I don't know about far-red light.  But you could easily 
measure the transmission before and after placing the dish of water in the 
light path.

>Water is a very good filter of red light - with about 90% gone in the
>first meter of water in a lake.  I would expect an even higher % for far
>red because it has less energy.

Mark D. Spiro
Department of Biology
Bucknell University
Lewisburg, PA 17837
spiro at bucknell.edu
phone:  (570) 577-3486
fax: (570) 577-3537


More information about the Plant-ed mailing list