> Good to have you back, Olin, and thanks for responding.  So let's assume
> I'm going to use a PWM rate of a couple hundred Hz.  Would something
> simple, like going from 0/256 to 256/256 PWM duty cycle over a period of a
> second or so, be sufficient, or am I missing something?

A second or so is usually fine.  A bit longer wouldn't hurt unless there is
a reason the light needs to come on quickly.  Just keep in mind that the
earlier pulses are going to draw hefty currents, which is another reason for
keeping them short and starting slowly.

By the way, you could increase efficiency by using a higher voltage and
reducing the maximum PWM duty cycle accordingly.

********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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