Replacing Incan's on older wireframes

[flstc_93]

I am getting ready for my last season of decorating. I have several wireframes that still have incan minis. I want to replace some of the worn and blown bulbs before I get ready to sell after the season. I have tons of bulbs that I saved from bad strings over the years. Problem is, when I change out the bulb (remove from old socket and put in socket for wireframe string) the bulb blows. What do I need to know about my bulbs so I can get appropriate replacements??

 

[Dougp]

The bulbs must use the same voltage or they will blow or be brighter or dimmer.

 

[MartinMueller2003]

Common string sizes are 15 / 30 / 50.
Putting a bulb from a 50 into a 15 / 30 will burn it out.
Putting a bulb from a 15 into a 50 will cause it to burn dim.
100 strings are actually 2 x 50.