supply, current outputs during the first 2 ms of operation are
slightly fluctuating. So on the time axis we show the plots having
8 ms duration, between the 2 ms and 10 ms points.
We see that amplitudes of pulses applied to LEDs can be
increased to at least twice the rated voltage, and the array still
provides a stable light output. From Table 2, temporal stability of 8
out of 9 irradiance levels is better than 3%, one level is over 3% but
still under 5%. Therefore, the 5 simulators are Class B. In the IEC 891
Standard the term “instability” is used for temporal stability of
irradiance.
Spatial uniformity of irradiance on the 17*17 cm2 test plane is
also measured, but not reported here, and is better than 5%. The 5
simulators are Class B.