FORS External Calibration Units - ECUs
ECU Calibration Exposure Times with FORS
The following exposure times correspond to a flux of about 30000 ADU in high gain:
Wavelength Calibrated Flux for grisms 300V and 300I/OG590 (FORS1)
The bump in the blue is caused by the blue lamp which is used with a cut-off filter to reduce the red and IR flux, while having the highest possible flux levels in the blue.