What are the large, old-fashioned lights called?
C-7 and C-9 lights were once the most common lights and are still used today for outdoor decorating because of their durability. Typically, each bulb runs at about 5 to 10 watts, meaning your entire strand could be from 125 to 250 watts. This generates a lot of heat, so C-7 and C-9 lights are not recommended for indoor use. One bonus is that, since they were wired together in a parallel formation, one bulb could blow out or be loose, and not effect the rest of the strand.
