Expts with different colors of light

[Bill Williams]

...not to belabor the obvious, but be *sure* you measure total PAR. 
Red filters, particularly, can reduce PAR nearly to zero, changing 
your students' experiment from one on spectral quality to one on 
total fluence rate.


W2
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William E. Williams
Biology Department
Saint Mary's College of Maryland
18952 E. Fisher Rd.
Saint Mary's City, MD  20686-3001
(301)862-0365
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