USE AND EVALUATION OF BIOLOGICAL SPECTRAL UV WEIGHTING FUNCTIONS FOR THE OZONE REDUCTION ISSUE - Environmental UV Radiation: Impact on Ecosystems and Human Health and Predictive Models - page 73

Figure 4. Two commonly used BSWF: the generalized plant response of Caldwell [9] (solid line) and the
composite DNA damage function of Setlow [8] (dashed line). Spectra are normalized at 300 nm.
This error is negative, or an underestimation of the RAF by using the "wrong'' BSWF
and the error increases in magnitude as the ozone layer is diminished to greater extent.
The "enhancement error'' is the error in determining how much supplemental UV-B
should be supplied from lamp systems to simulate a given level of ozone reduction in
field experiments. To predict the amount of lamp UV needed, several factors come into
play including the RAF itself, the differences in the solar spectral irradiance with and
without ozone reduction, and the spectral irradiance coming from the lamp system. The
details of these calculations are given elsewhere [11].