A19 is a kind of bulb and is a name for North America. A indicates that the shape of the bulb is a spherical bubble.
19 is the size of the bulb, that is, the size of the largest diameter of the bulb is 19*(1/8) inches. It is about 60mm.
Another name is the blister of the A60. LED bulbs on the market generally include: hemispherical bulbs A15, A17, A50, A60, global bubble G45, G55, G80, G120 and so on.
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