> How about this for a whacko idea, rectify lighting
> circuit to DC in the switchboard, then use a PIC

I'll reply to this later but here's something I just thought of -

Probably the most common users of high wattage DC
bulbs would be vehicles. Are there any comparable stats
for car lights blowing in same way that we seem to
have experience for mains bulbs ? As I ride around it
appears to me that almost all cars have a full set of lights
yet I know plenty of people that are forever changing
house bulbs

Don't know if that's just a "so what ?" question. So what
if it is ? ;-)

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