Expts with different colors of light

Bill Williams WEWilliams at osprey.smcm.edu
Thu Feb 24 17:29:16 EST 2000

...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.

William E. Williams
Biology Department
Saint Mary's College of Maryland
18952 E. Fisher Rd.
Saint Mary's City, MD  20686-3001

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