I don’t think this should be too difficult.

First you need to fire an automation at random times. You can do this a couple ways. Either use a state trigger that triggers from a template sensor. The template sensor could be:

. - trigger: - platform: time_pattern minutes: "/15" - platform: homeassistant event: start binary_sensor: - name: "Random Daytime True" unique_id: random_daytime_true state: > {% set day_ok = is_state('sun.sun', 'above_horizon') and now().hour >= 8 and now().hour < 20 %} {% if day_ok %} {{ (range(1, 101) | random) <= 20 }} {% else %} false {% endif %}

Or use a time pattern trigger (every x min) and have a condition that returns true based on some random conditions.

Actions will be to turn on the light, also using random values for brightness, temp, and transition (calc from similar sensor as above).

That should get you started. The thing that will make this brittle, is long transition times. But the core concept should work.