| We computed the ratio of direct to total horizontal irradiance as a function of SZA and column ozone amount. |
| Although the solar simulator provides a higher spectral irradiance throughout the UV, its spectrum differs from natural sunlight. |
| An additional advantage of this method is that UV-B irradiance can be determined at any depth within a leaf. |
| The scene observed in false color illustrates the incident light pattern so explicitly as to delineate irradiance isopleths. |
| In the preillumination experiments the cells were exposed to lights of different irradiance, dose and direction. |
| From these values the integrated irradiance values are obtained for the desired time interval. |
