Yeelight C40030W400MM

Yeelight C400 is the 400 mm, 30 W configuration of the Yeelight Mars RGB smart ceiling-light family. The source SKU explicitly identifies this size/power combination, which is important because the same seller listing also carries other diameters and wattages.

The fixture combines its main room-lighting function with RGB side-light effects. The marketplace source advertises up to 16 million RGB colors and a color-temperature range reaching 6500 K, allowing the light to serve both practical and decorative scenes.

This model connects over Wi-Fi and is advertised for the Mi Home app as well as Yeelight/Google smart-home control. In Mi Home it can participate in schedules and automations with other compatible devices.

The published specifications intentionally focus on the SKU-specific size and rated power plus the common Wi-Fi/Mi Home functionality. Other photometric values are not added because the seller evidence does not provide a trustworthy exact-model lumen or color-rendering specification for this C400 variant.

The seller listing contains multiple Mars ceiling-light sizes, so the C-series SKU code, wattage and diameter should be checked together. The 300 mm and 400 mm versions are different physical fixtures even though they share the same broad RGB/Wi-Fi feature set. Confirm ceiling space and the intended room coverage before treating another size from the same listing as interchangeable.