Help! Light brightness by lux level automation

[pnbruckner (Phil)]

@pnbruckner

This will trigger whenever the state or any attribute of sensor.room1_lux changes. Yes, I know what the docs say about the numeric_state trigger, but they’re wrong; see documentation PR 6054 . I’ve looked at the code, and even tested it - it simply does not just fire once when the state “crosses a threshold.”

Ignore what I said here. Seems I had come to this conclusion incorrectly.

[andylebedev (Andy)]

Hi Russel,
could you please explain logic after your code and numbers? it works great, but I’m trying to better understand what those numbers are (14000 and 76.5), to make thinks adapted to my number of installed lights
I’m using it with 6 xiaomi lightbulbs on top, and xiaomi lightsensor on my desk. and when I add additional lightbulbs i get more lumens, say 1 lightbulb gives 47 lum with script (97 max), 5 gives 105 lumen, and 6 gives 116.

I’m in 60 square feet room with no windows and its not bright enought

          brightness: >
            {%- set lux = states.sensor.lumi_lumi_sen_ill_mgl01_8dbf783c_illuminance.state | int -%}
            {%- set perc = (14000 - lux) / (14000 / 100) | int -%}
            {{ ((76.5 * perc) / 100) | int }}