 For a short time, these early miniature lights were manufactured using E5 screw bases, rather than the current wedge base and were called "Italian lights".Sets of ten (12 volts per bulb) were made for very small trees, but are quite hot, and are now usually used for tree toppers only.This number is convenient for stars, which have a total of ten points (five outward and five inward), and often have another light in the middle, occasionally on both sides.