I have a MI LED Ceiling light from Yeelight and in Mi Home app I want to create a scenario using this light as IF condition to trigger other action but I only see the light as THEN condition, how can I use it as IF condition?
You can’t.
And what exactly wold you use as IF condition, it is not a sensor it is a lamp?
Cause I have a relay controller and I want to bind it, if lamp is turned on -> relay controller turned on, if relay controller is turned on -> turn on lamp
How do you turn on the relay controller?
With a physical switch, this would allow me to let co-exist the switch with the Smart lamp without ever unplugging the current to the lamp
Strange usage 
You could use the wireless switch to turn on both relay and smart lamp…
But the smart switch won’t be similar to all the existing switch in my home 