Good idea!
But I guess that the command only works if I turn on/off the bulbs through Domoticz and not by the remote/app, right? Because the bulbs don't send a state change to the box/Domoticz

That's how I do it with my milight bulbs:

return {
on = {
timer = { '20 minutes before sunset', '10 minutes before sunset',
'every minute between sunset and 21:30'}
},

execute = function(domoticz, roomSwitch)
local Time = require('Time')
local currentTime = Time()
Stunden = os.date("%H ...