Example of transition simulate sunrise and sunset

I try to simulate a sunset and Sunrise for my birdcases. Controlling a Fibaro RGBW switch, all colors connected to a white led.
I did use a node tile called “lullaby” creating a transition in severall steps.
This node worked fine, but is using a hugh amount of Zwave capabillity slowing down my meshnetwork and make it not reliable while doing this transition.
So I wonder if there are ideas to make a transition lets say from about 15 minutes going from 100% to 3% brightness without occupiing the meshnetwork to much.

Seems like you can set the transition time in parameter 151 and 152 of the Fibaro RGBW Switch.
Of course, this requires that you always want to use this specific transition time. Otherwise, check if there is a an attribute for transition time. For example with HUE lights you can specify the transition time in the turn_on service call.

thanks for the answer

I tried:

{
    "brightness_pct": "3",
    "transition": "120"
}

But still going to the new state in a flash.

I think I need to write severall steps in time by myself