@Ravinss,

So any kind of smart bulb is going to always require that it is being supplied full power, as it is expecting a consistent power source for operation.

The Tapo bulbs will not function if they are not being given full power, and can only be dimmed via the Tapo App. 

If you want to use the dimming functionality of the ES20M, you would need to use a typical dimmer-compatible light bulb.

Keep in mind that if the ES20M were to turn off or fall below 100%, you would not be able to control the bulbs via the Tapo App. Instead, you would need to first turn on the ES20M to 100%, wait for the bulbs to connect to your Wi-Fi, and then you would be able to control the bulbs in the app.

If you were looking to add a Dimmer control to your wall for the Smart Bulbs, you would need to look towards the S200D - Smart Dimmer Button.