Re: LED's as an enlarger source

No, you don't strobe the LED's -- while they can take more current (for
Agilient super-brites about 100ma) the light output is proportionate to
current -- thus if you had a 50% duty cycle at 80ma you would get the same
output as 100% duty cycle at 40ma.

"Collin Brendemuehl" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> "Dennis O'Connor" <[EMAIL PROTECTED]> wrote in message
news:<[EMAIL PROTECTED]>...
> > Nuts&Volts would have published it in a heart beat... Probably still
will...
> > Denny
>
> Wouldn't be too difficult, either.
> Since the LEDs will be strobed (cutting current consumption way back,
> thus controlling heat) one could easily vary the frequency to suit
> the measured output of each colors set.   To vary each level as required
> a simple switch read could be used to allow user control.
>
> Personally, I'd use a PIC, but there are may others that would be
suitable.
> Low power consumption would be paramount.
> LED layout could be a simple matrix so that colors mix evenly.
>
> This doesn't sound too difficult ... all I need is T - I - M - E !
>
> Collin