> * I am also considering a 2 wire bus where power would be interrupted
10 times per
> second to allow data to be transmitted.  This would require the lamps
to store power
> briefly.  In this case , a much higher baud rate would be desired.
115K baud would
> suggest a no-power gap of 1 msec.  This would allow ~ 100 bits which
should be
> adequate for one lamp to be commanded and acknowledge the command.  I
am wondering
> what the cost will be to provide a lamp the ability to bridge a 1 msec
power gap.  (
> Or maybe I don't have to .... 1 msec every 100 msec might not be
visible. )

Investigate how model railways drive DCC trains, they use a square wave
on the rails and pulse width modulate it to send the digital data. Check
out the NMRA standards at
http://www.nmra.org/standards/DCC/standards_rps/DCCStds.html for info.
This should set you on a suitable path.
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