How to make a card visible only if a light brightness in below 100%?

Configuration Frontend
1

So I want a button on a bubble card (they are from hacs) that set a light brightness to a 100% and I want this button to only appear if the light brightness is below 100%. I failed to do that so I tried with a regular Button Card, this is what I’ve come up with:

condition: numeric_state
entity: light.yeelink_bslamp2_ac48_light
attribute: brightness
below: 100

I tried different lights, different values, nothing works.

image
image504×480 17.5 KB

The light is currently at 25% when taking this screenshot.
I’ve read many forum topics at this point and nothing works, please help me.

2

Are you sure your brightness is in %, not a value between 0 and 255?

Check in the Developer Tool - States

3

It is in % (it is set at 42% as I am taking the screenshot):

image
image923×446 9.93 KB

I also tried to use light.brightness as the attribute instead of just brightness but it doesn’t work either.

4

Your screenshot shows 2 ‘brightness’ attributes:

I seriously doubt that this one is in %:
image

And this one is not really called ‘brightness’ as shown in you YAML sample:
image

But if you multiply 255 x 42% the result is …drum roll please… 107.1

So 107.1 is NOT below the threshold you have here:

image
image375×114 2.83 KB

5

I missed there was a second brightness attribute, but… drum roll pls… I can set the below value to 100, 255, 1000, or whatever and it still never works.

6

Works fine for me with brightness set to 49% in the frontend:

image
image744×213 7.04 KB

Try to replace entity with enttity_id

7

If I change to entity_id I cannot test because I get the following error message:

Screenshot_20250217-160806
Screenshot_20250217-1608061440×877 77.9 KB

This is very odd considering it is working for you. I double checked for typos (you got one in the last line of your post) but there are none.
My home assistant versions are:

  • Core 2025.2.4
  • Supervisor 2025.02.1
  • Operating System 14.2
  • Frontend 20250214.0

I think I have the latest, so maybe you have an older version and they stopped supporting the entity_id property, or something is wrong with my ha.

8

This is THE way you reference entities in HA.

No. Something else is wrong chair is not incorrect with thier analysis…

9

The config with entity doesn’t cause an error (just it does not pass when it should):
https://imgur.com/3xNHzzc
The one with entity_id:
https://imgur.com/iC22q4S
Causes an error:

Screenshot_20250218-103929
Screenshot_20250218-1039291440×3120 229 KB

The id is correct btw:
There should be an image of the entity here, but as a new user I am limited to 2 links and 1 media :frowning:

I concur that something must be wrong, however I’m new to home assistant and even with google I cannot figure it out. So any help is greatly appreciated.

10

Here’s the last & final idea I have:
Create a template sensor from the attribute and use the state of the sensor to manage visibility.

1 Like
11

The sensor solution works perfectly, here is the sensor:

binary_sensor:
  - platform: template
    sensors:
      bedside_lamp_100:
        friendly_name: "Bedside Lamp 100% Brightness"
        value_template: >-
          {{ 
            is_state('light.yeelink_bslamp2_ac48_light', 'on') 
            and 
            state_attr('light.yeelink_bslamp2_ac48_light', 'brightness') == 255
          }}

However it means I have to make a sensor for every light for which I want to make this conditional button, so if you have a solution to make the process easier or to fix the issue without using the sensor I am interested.

In the meantime this solution will work, thanks for your help.