Jinx writes:
>First you have to define and find a "good" 240V bulb !
>
>They don't last as long as 120V bulbs. The filament is thinner.
>Someone did say here once that they used 2 x 120V in series
>and got pretty good economy. Also, adding a series resistor
>can increase bulb life significantly

	Well, I had to think a bit about why the manufacturer couldn't
simply roll in more tungston wire of the same gauge as the 120-volt
bulbs, but it really wouldn't work unless someone figured out how to
formulate a higher-resistance tungston wire that was the same gauge as
that used in the 120-volt bulbs.

	A resistor causes the bulb to light more gently because
it initially takes the in-rush of the filament current when it is
cold.  If you put two bulbs in series, they will reach operating
temperature faster since they at least theoretically will always have
half the supply voltage across them.

Martin McCormick
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