Why are smart E12 bulbs dimmer than regular candelabra bulbs?

The small B11/B12/G16.5 envelope leaves very little room for the Wi-Fi radio, driver, and LED chips, so output is typically capped around 300–550 lumens — roughly 40–60W incandescent equivalent. Reviewers across specialist communities repeatedly flag this: if you need a bright chandelier, plan to use more bulbs rather than expecting one smart E12 to match a traditional 75W candelabra.