Light output from an LED can be changed by the current
through it. Hook one up to a current controlled power supply
and vary the current, you can see that the intensity changes
as the current increases. Another example:
http://www.nichia.co.jp/specification/appli/controlling.pdf
Light output is fixed only if the current through it is fixed.
Wayne
At 12:13 PM 10/13/2004, you wrote:
>You might be right, but I doubt it highly. Most LEDs are fixed output
>and variable output LEDs are a more recent development than Nikon's use
>of them in scanners.
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