>
> I've designed some dental curing lights using a boost converter off a
> lithium ion battery and using a current sense amplifier for feedback. As
> pointed out above, the LED voltage does vary. Something I've wondered
> about is doing power regulation instead of current regulation. It seems
> that this would result in more consistent light output and dissipation
> than using just current regulation. It, of course, would be a bit more
> complicated and perhaps not worth the effort. Has anyone done V*I
> regulation of LEDs?

As I understand it, voltage is a function of wavelength and
temperature, and current controls brightness.  I've used constant
current sources and sinks, with unregulated voltage feeding them.
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