Photocurrent in photodiode smaller than expected
Actually, that sounds about right. I don't know where you got the 800 µA figure from — both the table and the graph indicate much less.
&quot;Bright office lighting&quot; is about 500 lux. The sensitivity of the SFH 203 P is specified as minimum 5 µA, typical 9.5 µA @ 1000 lux.
The graph in the middle of page 4 agrees with this.
The rise and fall times were measured with a much brighter pulse of light than room lighting -- probably a laser or flashtube. Interestingly, none of the graphs go up that far, implying that that would not be a &quot;normal&quot; regime of operation.