Why don't you buy a voltmeter (multimeter) and a book on how to use a
voltmeter?

http://www.amazon.com/How-Test-Almos...ref=pd_sim_b_2


"gcotterl" wrote in message
For next Christmas, what kind of Christmas Light Strings should I buy
for the outside of my home?

On some of the strings I currently own:

1) all the bulbs light
2) none of the bulbs light
3) the bulbs on only a section of the string light

On the strings I want, if a bulb dies or is missing, the rest of the
bulbs should light.