The way they are used now in low-power projects is
that they are pulsed (PWM). The eye sees a rapidly-
pulsed 10% ontime as solid and the battery savings
is significant.

Another way to use LED's is to only wink every few seconds.
That further reduces consumption overall.

--Bob

Brooke Clarke wrote:

> Hi Bill:
>
> For years I've been searching the Jameco catalog for low current LEDs, 
> and in Catalog 244 they are stocking units speced for 1 and 2 ma.  I 
> have tried using other LEDs at reduced current and so far all of them 
> have shut off at the 2 ma level (or they are so dim by comparison to a 
> "true" 2 ma LED that it's the same as being off).
> These are all rated at 1 or 2 ma:
> Jameco #    p/n
> 253690CR    HLMP-1700
> 253729CR    HLMP-K150
> 253681CR    HLMP-1790
> 253673CR    HLMP-1719
> 253817CR    HLMP-4700
> 253850CR    HLMP-D150
> 253833CR    HLMP-4740
> 253825CR    HLMP-4719
>
>
> My guess is that Jameco got a good deal on a remainder lot.  It's too 
> bad these are not being made any more because for battery powered 
> devices the low current LEDs are the way to go.
>
> Have Fun,
>
> Brooke Clarke, N6GCE

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