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U Shaped Fluorescent Light Bulbs

U Shaped Fluorescent Light Bulbs

The most common form of fluorescent lamp is a tube with two pins on each end. The diameter of the tube is described in eighths of an inch, as it is for incandescent lamps, so a fluorescent lamp 1½ inches in diameter is a T-12. The 2-pin bases (called bi-pin bases) come in several sizes, but by far the most common in homes is the medium bi-pin.