FYR in a recent experiment I found regular photodiode to be at least 50x
more sensitive than a led (to visible light). Extremelly low currents you
would get out of a LED are very noise sensitive.

2008/11/21, Xiaofan Chen <xiaofanc@gmail.com>:
>
> On Thu, Nov 20, 2008 at 11:01 PM, Michael Rigby-Jones
> <Michael.Rigby-Jones@bookham.com> wrote:
> > FWIW I have used a red LED as a photodiode before, it did work but
> > wasn't very sensitive.
>
> That is strange. You might use a better photodiode. I would say
> that a Photodiode should be much more sensitive than
> a LED as the detector.
>
> Xiaofan
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-- 
Ariel Rocholl
Madrid, Spain
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