Thanks cy.
With one of these, 54852A Infiniium Oscilloscope and InfiniiMax 1131A Probing System, with additional options added (heheh, check out the list price for it at this URL):
http://we.home.agilent.com/USeng/nav/-11496.536894341/pd.html
And a rather accurate and quite fast light meter circuit I built using some NPN 5 GHz fT wideband transistors, a very low noise and low offset voltage, low offset bias and low offset current, very high input impedance, ultra low noise, high-precision, 180 MHz op-amp rigged as a transimpedance/transconductance amp. And a very low capacitance (high speed) photodiode, which is reverse biased to further reduce it's capacitance. Back when I designed it, it would follow a light pulse with a 200nS rise time, rather accurately, no waveforms still kicking around on that one. FYI, 200nS is about 200 billionths of a second, and to see something that fast and follow it's edge, it has to be even faster. I never did test how fast it really is, because it was adequate for what I needed, and I didn't have time to create a faster light source.
FYI, the waveform above is for level 5, if I recall correctly.
This one here, I believe which was level 1, I'll try another measurement when I get a chance, and find out (it could have been another level):