From: "Bob Blick" <bblick@sonic.net>
Sent: Monday, September 05, 2005 7:41 AM

> > What are the speed restrictions with white LEDs?

> White LEDs are Blue LEDs with a phosphor layer. So although the
> blue part will have a rise time <1usec, the rest of it will be slow
> responding. How slow, I don't know. White LEDs tend to be quite
> blue-looking in general.

I knew that, but since my experience with white LEDs they are fast enough
for a stroboscope they should be fast enough for a propellor clock.  I
thought you might have been offering some more quantitative information.

I'll be interested to hear the results of the experiment you mentioned you'd
do elsewhere on this thread :)

Jason


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