Fix zha illuminance measured value mapping

[floriankisser]

Proposed change

According to the spec (chapter 4.2.2.2.1) values 0 and 0xFFFF are "too low to be measured" and "measurement is invalid".

The current behavior of mapping everything through the function leads to "too low" becoming 1 lux (still brighter than the full moon) and "invalid" becoming an immensely bright value. Instead they should be mapped to 0 lux and no value respectively.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue: ZHA Illumination value parsed incorrectly #23290
• Link to documentation pull request:

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• The code change is tested and works locally.
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[home-assistant]

Hey there @dmulcahey, @Adminiuga, @puddly, @TheJulianJES, mind taking a look at this pull request as it has been labeled with an integration (zha) you are listed as a code owner for? Thanks!

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[dmulcahey]

Thanks!!

Stale