A19 is the shape the whole lamp aisle is measured against, and the range is built out accordingly: 6W, 9W, 12W and up to a 28W high-output A21, at 450 through 2,605 lumens, in 3000K soft white and 5000K daylight. Dimmable and non-dimmable are separate SKUs, and multi-packs run alongside singles.
Wattage equivalence, lumen output, colour temperature, base and dimmability are published per SKU. In a category where the buyer is matching an existing planogram, a wrong substitution on dimmability or colour temperature is the most common cause of a return.
Multi-packs are the volume driver here and singles hold the facing. Step across to filament for exposed-bulb fixtures, or to incandescent A19 where replacement demand is still live.