On Wed, 15 Jan 2003, Micro Eng wrote:

*>Just pondering this on my way to work...after being annoyed by some of the
*>new LED based taillights

Luminance depends on current linearly. Brightness depends on Luminance,
logarithmically (over a certain part of the eye dynamic range). The best
way to change brightness is to control current in any way you like. PWM
works great but in a car a linear current regulator would notbe a problem.
imho.

Peter

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