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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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120V 28W LED 3000K Warm White A21 Light Bulb
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What is The Difference Between A19 and A21 LED Bulbs ?
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Vintage Bulbs & Lamp Parts Blog
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GE Lighting 45657 Reveal LED A21 Light Bulb with Medium Base, 14-Watt, 1-Pack
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A21 vs A19 LED Light Bulbs — 1000Bulbs Blog
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Guide to Light Bulb Sizes and Shapes, Blog
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A-Type LED Bulbs
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EcoSmart 60-Watt Equivalent A21 Dimmable CEC Battery Backup LED Light Bulb with Selectable Color Temperature (1-Pack) 11A21060WCCTB01 - The Home Depot
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E26 vs A19: What's the Difference?
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Everything You Need to Know About A21 Bulbs
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