A19 vs A21 Light Bulbs, Blog
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Two standard light bulb base sizes are available today: A19 and A21. Although dozens of other designs and options are in the marketplace, most homes and businesses use these options for their everyday lighting needs.
When comparing A19 vs. A21 light bulbs, the primary difference is the size. You can find higher lumens options with a more extensive base, but the rest of the technology remains the same.
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