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Re: Aquatic Plants Digest V3 #713

At 03:51 PM 12/16/98 -0500,  Dorian McMillan asked:
>midday sun output on a clear day is ca. 2000 micromol/m2/sec, 
>I've been told that you could probably build a PAR meter for around
>$25--the trick is that it must be calibrated 

How about calibrating it agains midday sun output on a clear day?

Dave Gomberg, San Francisco            mailto:gomberg at wcf_com