Re (2): Voltage halver.

Hello Chris,

In article <vhvPN.263346$yZ2.66284@fx13.ams4>, Chris Jones <lugnut808@spam.yahoo.com> wrote:

If you connect two identical bulbs in series, then the voltage across
each will be half of the supply voltage. So, connect another identical
bulb in series. You won't find a simpler circuit!

Understood.  Thanks.  No spare bulb handy but can put a resistor in
series with the bulb. 

Switched voltage halving would be more efficient.

A 6 V, 5 A adapter similar to eBay 305207182573 would be even better
but I haven't found one.

Thanks,         ... P.