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The number 19 designates the size. Bulbs.com has a great light bulb shape chart for reference. The site also has a handy light bulb base chart.
Let Inga Tell You: The language of light bulbs can easily leave one in the dark Incandescent vs. LED, watts vs. lumens, A19 base vs. E26, Kelvins — here's a non-expert attempt to shed some light ...
Base size Most light bulb bases in the United States are of medium size, designated as E26 (Edison). Note that there are certain bases, like candelabras that require a small size light bulb (E12).
Most light bulb bases in the United States are of medium size, designated as E26 (Edison). Note that there are certain bases, like candelabras that require a small size light bulb (E12).
Most light bulb bases in the United States are of medium size, designated as E26 (Edison). Note that there are certain bases, like candelabras that require a small size light bulb (E12).
Base size Most light bulb bases in the United States are of medium size, designated as E26 (Edison). Note that there are certain bases, like candelabras that require a small size light bulb (E12).
Most light bulb bases in the United States are of medium size, designated as E26 (Edison). Note that there are certain bases, like candelabras that require a small size light bulb (E12).
Base size Most light bulb bases in the United States are of medium size, designated as E26 (Edison). Note that there are certain bases, like candelabras that require a small size light bulb (E12).