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I *should* have written:
>(d) ....
>has a huge advantage in that you run a say 6 Volts rated bulb from
>a say 10 Volts source.

The essence being that the bulb is rated for a voltage a few
volts below the volatage of the batteries under load.
The PWM will then pulse the current through the bulb at a variable
rate automatically adjusted so that the *average* current is
constant ( preferably we run a halogen bulb at full brightness )
irrespective of the state of battery discharge (and battery voltage).
This works well as long as the battery voltage is above that of the
rating of the bulb. If we discharge the batteries past this point
the PWM controller is locked "on" and the bulb dims as the batteries
discharge further.

john 015

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