I am trying to measure very high light pulses by using photodiodes. Light levels are expected to be upwards of 2-3W of irradiance. Pulse-widths are from 20uSec to 1mSec. Example light source is a highly over-driven high brightness LED, typically 200-300mW in power (during recommended current levels) My basic design is to have a reverse-biased photodiode fed into a voltage->current converting circuit. The pulsed light will excite the diode and the circuit should effectively convert voltage output from the diode to a current output so I can estimate the power output from the pulsed light by following a responsivity curve. The problem is, I can't find a way to measure such high light levels with these devices. This is a very low-speed application, 10-20Hz. All the photodiodes I can find saturate at very low levels and I can only read low levels of power. Anyone have any ideas?