On Fri, 23 Dec 2005 11:45:11 -0000, Rob Morley
wrote:

In article ,
says...
snip
Problem sorted and I don't need to pull out 20 bulbs to test with the
meter only to discover it's the last one that is class F.


On a string of 20 bulbs you shouldn't need to take more than 11
resistance readings.

Binary search. yes I know, but that would have meant going home and
back again for the meter.


--

..andy