Mean directional response of
replicate meters. Directional
response measurements were
made by direct side-by-side
comparison to the mean of
replicate reference quantum
sensors.
Directional, or cosine, response is defined as
the measurement error at a specific angle of
radiation incidence. Error for Apogee DLI
meter is approximately ± 5 % at solar zenith
75°.
-5
-4
-3
-2
-1
0
1
2
3
4
5
0 10 20 30 40 50 60 70 80 90
Difference [Percent]
Solar Zenith Angle [Degree]
DLI-400
DLI-500 and DLI-600
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