On Tue, 7 Jul 1998 00:07:28, -0500, JNVS44B@xxxxxxxxxxx (MR THOMAS N
CURLEE) wrote:
>Frank:
>
>I agree about the relative unknown voltage drop across the diode. I
>assumed that the actual voltage wasn't important, just that you
>needed to drop a little over one volt. If you were using the
>modeling lights for actually exposing the film the voltage would need
>to be regulated very closely to maintain color temperature.
>
>Here's a thought. Using these white light LEDs you could vary the
>light output by varying the current but would have the same color
>temperature (mostly, it might vary slightly). If they get cheap
>enough you could use an array of them for a modeling light and then
>pulse the same array at a much higher current for the actual exposure.
> A 'solid state strobe'. You could even make a 'strobe' with a FP
>mode. You heard about it first here, folks.
>
>How much do the white LEDs cost now and what is the mcd output?
>
>Tom
Hi Tom.
One of my sources is at http://www1a.mesh.ne.jp/nichia/wled-e.htm
It says 600 mCd at 20 mA and 3.6 V, color temp 6500 K.
Another is a German shop. Their LEDS are at
http://www.sander-electronic.de/opt1.htm#SHRW
$ 10 a piece, up to 3000 mCd strong, 6500-8000 K
(All SHRW are white LEDS, I think)
Let me know when yo finish your prototype! ;-)
Frank.
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